Chameleon Antenna CHA MPAS User manual

HF Modular Portable
Antenna System
(CHA MPAS)
Operator’s Manual
California - USA
WWW.CHAMELEONANTENNA.COM
VERSATILE –DEPENDABLE –STEALTH –BUILT TO LAST

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Table of Contents
Introduction ..............................................................................................................................................4
HF Propagation ......................................................................................................................................... 4
Parts of the Antenna.................................................................................................................................5
Antenna Configurations............................................................................................................................7
Manpack Vertical ..................................................................................................................................7
Portable Vertical ................................................................................................................................... 8
Horizontal NVIS ...................................................................................................................................10
Sloping Wire........................................................................................................................................11
Inverted “V” ........................................................................................................................................12
Inverted “L”.........................................................................................................................................14
Tilted NVIS...........................................................................................................................................15
Recovery Procedure................................................................................................................................16
Troubleshooting......................................................................................................................................17
Specifications ..........................................................................................................................................17
Accessories..............................................................................................................................................22
Chameleon AntennaTM Products............................................................................................................23
References ..............................................................................................................................................24
Be aware of overhead power lines when you are deploying the CHA MPAS antenna system. You could be
electrocuted if the antenna gets near or contacts overhead power lines.
LEGO® is a trademark and/or copyright of the LEGO Group. ©2016 the LEGO Group. All rights reserved.
All information on this product and the product itself is the property of and is proprietary to Chameleon
AntennaTM. Specifications are subject to change without prior notice.

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Introduction
Thank you for purchasing and using the Chameleon AntennaTM High Frequency (HF) Modular Portable Antenna
System (CHA MPAS). The CHA MPAS is designed to be the most versatile, high performance, and rugged portable /
manpackable HF antenna available using the “LEGO® BLOCK” approach, as described by Survival Tech Nord. The
core components of the antenna system, see plate (1), are: a CHA HYBRID-MICRO portable base, 60 feet of wire, a
10’8” military-style collapsible whip antenna (CHA MIL WHIP), and a clamp-style antenna mount (CHA JAW
MOUNT). Available system options (sold separately) include, a 6’6” collapsible extension (CHA MIL EXT), rugged
counterpoise kit, and coaxial cable assembly with integrated Radio Frequency Interference (RFI) choke. The
components of the CHA MPAS provide a continuum of portability and performance to meet your communications
requirements.
Plate 1. MPAS Core Components.
The integral broadband impedance matching
network transformer of the CHA HYBRID-MICRO
allows broadband antenna tuning. The antenna will
operate from 1.8 - 54 MHz (including 160m –6m
amateur bands) without any adjustment with a wide
range antenna tuner (the shortest configuration has
limited performance below 3.5 MHz). The CHA
MPAS is perfect for Emergency Preparedness and
Survival Communication. It is also the antenna for
hams that enjoy camping, hiking, biking or other
types of outdoor recreation which require
communication gear to be both effective and highly
portable. The CHA MPAS is configurable to facilitate
Near-Vertical Incident Sky wave (NVIS)
communication and is totally waterproof. The CHA
MPAS requires a wide range antenna tuner or
coupler. Antennas built by Chameleon AntennaTM
are versatile, dependable, stealthy, and built to last.
Please read this operator’s manual so that you may
maximize the utility you obtain from your CHA
MPAS.
HF Propagation
HF radio provides relatively inexpensive and reliable local, regional, national, and international voice and data
communication capability. It is especially suitable for undeveloped areas where normal telecommunications are
not available, too costly or scarce, or where the commercial telecommunications infrastructure has been damaged
by a natural disaster or military conflict.
Although HF radio is a reasonably reliable method of communication, HF radio waves propagate through a
complex and constantly changing environment and are affected by weather, terrain, latitude, time of day, season,
and the 11-year solar cycle. A detailed explanation of the theory of HF radio wave propagation is beyond the
scope of this operator’s manual, but an understanding of the basic principles will help the operator decide what
frequency and which of the CHA MPAS configurations will support their communication requirements.
HF radio waves propagate from the transmitting antenna to the receiving antenna using two methods: ground
waves and sky waves.
Ground waves are composed of direct waves and surface waves. Direct waves travel directly from the transmitting

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antenna to the receiving antenna when they are within the radio line-of-sight. Typically, this distance is 8 to 14
miles for field stations. Surface waves follow the curvature of the Earth beyond the radio horizon.
They are usable, during the day and under optimal
conditions, up to around 90 miles, see table (1). Low
power, horizontal antenna polarization, rugged or
urban terrain, dense foliage, or dry soil conditions
can reduce the range very significantly. The U.S.
Army found that in the dense jungles of Vietnam, the
range for ground waves was sometimes less than
one mile.
Frequency
Distance
Frequency
Distance
2 MHz
88 miles
14 MHz
33 miles
4 MHz
62 miles
18MHz
29 miles
7 MHz
47 miles
24 MHz
25 miles
10 MHz
39 miles
30 MHz
23 miles
Table 1. Maximum Surface Wave Range by Frequency.
Sky waves are the primary method of HF radio wave propagation. HF radio waves on a frequency below the critical
frequency (found by an ionosonde) are reflected off one of the layers of the ionosphere and back to Earth between
300 and 2,500 miles, depending upon the frequency and ionospheric conditions. HF radio waves can then be
reflected from the Earth to the ionosphere again during multihop propagation for longer range communication.
The most important thing for the operator to understand about HF radio wave propagation is the concept of
Maximum Usable Frequency (MUF), Lowest Usable Frequency (LUF), and Optimal Working Frequency (OWF). The
MUF is the frequency for which successful communications between two points is predicted on 50% of the days of
in a month. The LUF is the frequency below which successful communications are lost due to ionospheric loses.
The OWF, which is somewhere between the LUF and around 80% of the MUF, is the range of frequencies which
can be used for reliable communication. If the LUF is above the MUF, HF sky wave propagation is unlikely to occur.
The HF part of the Radio Frequency (RF) spectrum is usually filled with communications activity and an
experienced operator can often determine where the MUF is, and with less certainty, the LUF by listening to where
activity ends. The operator can then pick a frequency in the OWF and attempt to establish contact. Another
method is using HF propagation prediction software, such as the Voice of America Coverage Analysis Program
(VOACAP), which is available at no cost to download or use online at www.voacap.com.The operator enters the
location of the two stations and the program show a wheel with the predicted percentage of success based on
frequency and time. ALE, which is the standard for interoperable HF communications, is an automated method of
finding a frequency in the OWF and establishing and maintaining a communications link.
Even under optimal conditions, there is a gap between where ground waves end (around 40 to 90 miles) and the
sky wave returns to Earth on the first hop (around 300 miles). NVIS propagation can be used to fill this gap. The
frequency selected must be below the critical frequency, so NVIS is can normally only be used on frequencies from
around 2 to 10 MHz. Frequencies of 2 –4 MHz are typical at night and 4 –8 MHz during the day.
Parts of the Antenna
The CHA MPAS is comprised of the following components and sub-components, see plate (2):
a. Hybrid Micro Base
The Hybrid Micro Base provides a mounting base and impedance matching for the CHA MPAS.
b. Antenna Wire
The Antenna Wire is a 60 foot length of black insulated wire.

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c. Isolation loop
An Isolation loop is permanently attached to the Wire Connector (f) end the CHA HYBRID MINI Antenna Wire
(b) and both ends of the CHA HYBRID MICRO Antenna Wire.
Plate 2. Hybrid Micro Antenna.
d. Carabiner
The Carabiner is a removable pear-shaped stainless steel hooks with a spring-loaded gate.
e. Line Winder
The Line Winder is used to store the Antenna Wire (b). It enables rapid deployment and recovery of the CHA
HYBRID MICRO antenna.
f. Wire Connector
The Wire Connectors are located at one end of the Antenna Wires (b).
g. UHF Socket
The UHF Socket, SO-239, is located on the side of the Hybrid Micro Base (a).
h. Antenna Connection

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The Antenna Connection is located on the top of the Hybrid Micro Base (a). It is a 3/8” x 24 (fine thread)
female fitting.
i. Counterpoise Connection
The Counterpoise Connection is located on the bottom of the Hybrid Micro Base (a). It is a 3/8” x 24 (fine
thread) male fitting.
j. Antenna Shackle
The Antenna Shackle assembly, see plate (3), consists of a shackle, bolt, and nut. It is attached to the top of
the Hybrid Micro Base (a).
Antenna Configurations
Using the supplied components, the CHA MPAS can be deployed into a number of configurations. Seven
configurations (some configurations require optional components that are sold separately),see table (2), are
described in this manual, each with unique performance characteristics.
Configuration
Ground
Short
Medium
Long
Directionality
Manpack Vertical
↕
Omnidirectional
Portable Vertical
↕
↑
Omnidirectional
Horizontal NVIS
↓
↑
Omnidirectional
Sloping Wire
↓
↕
Unidirectional
Inverted “V”
↓
↕
↑
Bidirectional
Inverted “L”
↓
↕
Unidirectional
Tilted NVIS
↓
Omnidirectional
Table 2. Antenna Configuration Selection.
The table can assist the operator to quickly select the most appropriate antenna configuration to meet their
operational requirements. To use the table, decide which distance column (Ground = 0 to 90 miles, Short = 0 - 300
miles, Medium = 300 –1500 miles, Long > 1500 miles) best matches the distance to the station with whom you
need to communicate. Then, determine if the OWF is in the lower (↓ = 1.8 – 10 MHz) or upper (↑ = 10 – 30 MHz)
frequency range. Finally, select the antenna configuration with the corresponding symbol in the appropriate
distance column. All CHA MPAS configurations provide some capability in each distance category, so depending
upon the complexity of your communications network, you may need to select the best overall configuration. The
directionality column indicates the directionality characteristic of the antenna configuration. When using NVIS, all
the configurations are omnidirectional. Most configuration and frequency combinations will require a wide range
antenna tuner or coupler.
Manpack Vertical
The CHA MPAS Manpack Vertical configuration, see figure (1), is a broadband short range HF/VHF-LO antenna.
This configuration, which is especially designed to be manpackable, is omnidirectional and provides ground wave
communication on frequencies between 1.8 –54.0 MHz without using sky wave propagation. Performance is
limited below 3.5 MHz, but very good above 24 MHz. A single 25 foot counterpoise “tail wire” will provide a good
compromise between portability and performance or you can use the supplied 60 foot antenna wire as the

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counterpoise. An antenna tuner or coupler is required on most frequencies. Use the following procedure to install
the Manpack Vertical configuration.
Figure 1. Manpack Vertical.
Site Selection and Preparation
1. Select a site to deploy the CHA MPAS Manpack
Vertical configuration. Best ground wave
communication occurs when the radio set is
located in a clear area and the whip antenna is
vertical.
Refer to plates (2) and (3) for steps (2) through (6).
2. If attached, remove the Antenna Shackle (j)
from the Hybrid Micro Base (a) by loosening the
nut on the Antenna Shackle and then
unscrewing the Antenna Shackle from the
Antenna Connector (h). Store in secure place.
Connect the Hybrid Micro Base.
3. Attach a counterpoise wire to the Hybrid Micro
Base by placing the counterpoise wire terminal
lug over the Counterpoise Connection (i) and
tightening the nut (not supplied) until snug.
4. Connect a CHA RFI CHOKE and coaxial cable or
the Integrated RF Choke end of the CHA Coaxial
Cable assembly to the UHF Socket (g) on the
Hybrid Micro Base.
Raise the Antenna.
5. Extend the CHA MIL WHIP by unfolding the
sections of the whip, starting with the section
above the bottom section, and ensure each
section is fully seated onto section below until
the whip is fully extended.
6. Connect the CHA MIL WHIP to the Hybrid Micro
Base by carefully screwing the 3/8” base stud
into the Antenna Connection (h) until finger
tight.
Extend the Counterpoise
7. Extend the counterpoise wire along the ground
in any convenient direction. You can use the
supplied Antenna Wire (b), optional
Counterpoise Kit, or any wire at least 25 feet in
length.
8. Perform operational test.
Portable Vertical
The CHA MPAS with the optional CHA MIL EXT comprise the Portable Vertical configuration, see figure (2), which is
a broadband short to medium range HF/VHF-LO antenna. This configuration, which is especially designed to be
portable, is omnidirectional and provides ground wave communication on frequencies between 1.8 –54.0 MHz

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without using sky wave propagation. It also provides sky wave propagation, especially above 12 MHz. Using the
optional CHA JAW MOUNT, the Portable Vertical can be mounted on almost any support, such as a camouflage
netting support pole, fence post, picnic table, 3/8” heavy duty mobile mount, or the optional Chameleon
AntennaTM Tripod. The antenna works better when mounted above the ground, but will provide satisfactory
performance if ground mounted. One to four counterpoise wires, 25 feet in length should be used. They can be
quickly deployed and will provide good performance. You may also use the supplied 60 foot antenna wire as the
counterpoise. The antenna may also be attached to a standard 3/8” mobile mount on a stationary vehicle. No
counterpoise is required when the antenna is mounted on a vehicle. An antenna tuner or coupler is required on
most frequencies. Use the following procedure to install the Portable Vertical configuration.
Figure 2. Portable Vertical.
Site Selection and Preparation
1. Select a site to deploy the CHA MPAS Portable
Vertical configuration. Best ground wave
communication occurs when the radio set is
located in a clear area and the whip antenna is
vertical.
2. Clamp a CHA JAW MOUNT or other 3/8”
antenna mount to the support.
Refer to plates (2) through (4) for steps (3) –(8).
3. If attached, remove the Antenna Shackle (j)
from the Hybrid Micro Base (a) by loosening the
nut on the Antenna Shackle and then
unscrewing the Antenna Shackle from the
Antenna Connector (h). Store in a secure place.
Connect the Hybrid Micro Base.
4. If used, place the terminal lugs of the
counterpoise wires over the Counterpoise
Connection (i) on the Hybrid Micro Base.
5. Screw the Hybrid Micro Base Counterpoise
Connection into the 3/8” antenna mount until
finger tight.
6. Connect a CHA RFI CHOKE and coaxial cable or
the Integrated RF Choke end of the CHA Coaxial
Cable assembly to the UHF Socket (g) on the
Hybrid Micro Base.
Raise the Antenna
7. Extend the CHA MIL EXT by unfolding the middle
section of the extension, fully seating it onto the
bottom section, then unfolding the top section
and fully seating onto the middle section.

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8. Connect the CHA MIL EXT to the Hybrid Micro
Base by carefully screwing it into the Antenna
Connection until finger tight, see plate (3).
9. Extend the CHA MIL WHIP by unfolding the
sections of the whip, starting with the section
above the bottom section, and ensure each
section is fully seated onto section below until
the whip is fully extended.
10. Connect the CHA MIL WHIP to the CHA MIL EXT
by carefully screwing the 3/8” base stud into the
top section until finger tight.
Extend the Counterpoise
9. Extend the counterpoise wire(s) along the
ground in any convenient direction. You can use
either the Antenna Wire (b) or optional
Counterpoise Kit. The end of the counterpoise
wire(s) can be secured to the ground with a tent
stake.
11. Perform operational test.
Horizontal NVIS
The CHA MPAS Horizontal NVIS configuration, see figure (3), is a special configuration designed to provide good
NVIS propagation on lower frequencies. It is predominately omnidirectional and also provides medium range sky
wave propagation on frequencies above 10 MHz. It requires two supports that will enable the ends of the antenna
to be raised to a height of 10 –12 feet and 60 feet apart. A counterpoise wire, with a length of 50 to 55 feet, is
recommended. If a counterpoise wire is not used, the coaxial cable must be 25 to 100 feet in length, as the shield
of the coaxial cable provides the counterpoise. Use the following procedure to install the Horizontal NVIS
configuration.
Figure 3. Horizontal NVIS Configuration.
Site Selection and Preparation.
1. Select a site to deploy the CHA MPAS Horizontal
NVIS configuration. The site must have two
supports that will position the Hybrid Micro
Base and the end of the Antenna Wire to be at a
height of between 10 and 12 feet and 60 feet
apart. Higher or lower heights may be used, but
may reduce NVIS performance.
Refer to plates (2) and (3) for steps (2) –(11).
2. If not already attached, connect a Carabiner (d)
to the Isolation Loop (c) at the Wire Connector
(f) end of the Antenna Wire.
Connect the Hybrid Micro Base.
3. Temporarily remove the Antenna Shackle (j)
from the Antenna Connection (h). Place the
Wire Connector from the Antenna Wire over the
Antenna Connection and replace the Antenna
Shackle. Tighten the nut snugly.
4. Connect the Carabiner from the Antenna Wire
to the Antenna Shackle.
5. If using a counterpoise wire, connect it to the
Counterpoise Connection (i). Tighten the nut
(not supplied) snugly.

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Plate 3. Hybrid Micro Electrical and Mechanical
Connections.
6. Connect a CHA RFI CHOKE and coaxial cable or
the Integrated RF Choke end of the CHA Coaxial
Cable assembly to the UHF Socket (g) on the
Hybrid Micro Base.
Raise the Antenna.
7. Using a Bowline or similar knot, tie the end of a
long length (25 feet or more) of Paracord to the
Carabiner.
8. Using a throw weight or other method, loop the
Paracord over the support that is closest to
where the radio set will be located.
9. Raise the Hybrid Micro Base end of the antenna
to a height of 10 to 12 feet and secure it to the
support using a Round Turn and two Half
Hitches, or similar knot.
10. Using a Bowline, or similar knot, tie another long
length of Paracord to the Isolation Loop at the
end of the Antenna Wire.
11. Using a throw weight, or some other method,
loop the Paracord over the other support.
12. Raise the end of the Antenna Wire to a height of
10 to 12 feet, such that the Antenna Wire is not
quite taut, and secure it to the support using a
Round Turn and two Half Hitches.
Extend the Counterpoise.
13. If using a counterpoise, extend it along the
ground under the antenna.
14. Perform operational test.
Sloping Wire
The CHA MPAS Sloping Wire configuration, see figure (4), is a broadband short to medium range HF antenna. It is a
good general-purpose antenna, which provides acceptable ground wave and sky wave propagation, and can be
Figure 4. Sloping Wire Configuration.

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hastily deployed. This configuration is predominately omnidirectional, becoming slightly unidirectional towards
the end of the antenna wire as the frequency increases. The Sloping Wire requires one support and should be
mounted at a height of 25 to 40 feet for best performance. A counterpoise wire, with a length of 20 to 40 feet, is
recommended. If a counterpoise is not used, the coaxial cable must be 25 to 100 feet in length, as the shield of
the coaxial cable provides the counterpoise. Use the following procedure to install the Sloping Wire configuration.
Site Selection and Preparation.
1. Select a site to deploy the CHA MPAS Sloping
Wire configuration. The site must have a
support that will position the end of the
Antenna Wire at a height of 25 to 40 feet. If the
right support is unavailable, any convenient
object, such as a fence post or the top of a
vehicle, may be used as a field expedient
support with reduced performance.
Refer to plates (2) and (3) for steps (3) –(8).
2. If not already attached, connect a Carabiner (d)
to the Isolation Loop (c) at the Wire Connector
(f) end of the Antenna Wire.
Connect the Hybrid Micro Base.
3. Temporarily remove the Antenna Shackle (j)
from the Antenna Connection (h).
4. Place the Wire Connector from the Antenna
Wire over the Antenna Connection and replace
the Antenna Shackle. Tighten the nut snugly.
5. Connect the Carabiner from the Antenna Wire
to the Antenna Shackle.
6. If using a counterpoise wire, connect it to the
Counterpoise Connection (i). Tighten the nut
(not supplied) snugly.
7. Connect a CHA RFI CHOKE and coaxial cable or
the Integrated RF Choke end of the CHA Coaxial
Cable assembly to the UHF Socket (g) on the
Hybrid Micro Base.
Raise the Antenna.
8. Using a Bowline, or similar knot, tie a long
length (50 feet or more) of Paracord to or
Isolation Loop at the end of the Antenna Wire.
9. Using a throw weight or some other method,
loop the Paracord over the support.
10. Raise the end of the Antenna Wire to the
desired height and secure it to the support using
a Round Turn and two Half Hitches, or similar
knot.
11. Using a Bowline or similar knot, tie the end of a
short length (around 4 feet) of Paracord to
Carabiner.
12. Fully extend the Antenna Wire so that it is not
quite taut.
13. Drive a stake into the ground around two feet
beyond the end of the Antenna Wire and tie the
Paracord from the Hybrid Micro Base to the
stake using two Half Hitches, or similar knot.
Extend the Counterpoise.
14. If using a counterpoise wire, extend it along the
ground in any convenient direction.
15. Perform operational test.
Inverted “V”
The CHA MPAS Inverted “V” configuration, see figure (5), is a broadband short to long range HF antenna. This
configuration will provide good NVIS and medium range sky wave propagation on all frequencies and long range
sky wave propagation above 14 MHz. It is omnidirectional below 11 MHz and bidirectional towards the ends of the
antenna above 11 MHz. This is a good configuration for EMCOMM when communication is needed both inside and
outside an affected region and the region is too large or mountainous for effective VHF coverage. The Inverted “V”
requires one support in the center of the antenna wire and should be mounted at a height of around 30 feet for
best performance. A 60 foot long counterpoise, which is not supplied, is required. Use the following procedure to
install the Inverted “V” configuration.

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Figure 5. Inverted “V” Configuration.
Site Selection and Preparation.
1. Select a site to deploy the CHA MPAS Inverted
“V” configuration. The site must have a support
that will position the center of the antenna at a
height of around 30 feet. If the right support is
unavailable, any convenient object, such as a
fence post or the top of a vehicle, may be used
as a field expedient support with reduced
performance.
Refer to plates (2) and (3) for steps (3) –(11).
2. If not already attached, connect a Carabiner (d)
to the Isolation Loop (c) at the Wire Connector
(f) end of the Antenna Wire (b).
Connect the Hybrid Micro Base.
3. Temporarily remove the Antenna Shackle (j)
from the Antenna Connection (h).
4. Place the Wire Connector from the Antenna
Wire over the Antenna Connection and replace
the Antenna Shackle. Tighten the nut snugly.
5. Connect the Carabiner from the Antenna Wire
to the Antenna Shackle.
6. Using a Bowline or similar knot, tie the end of a
long length of Paracord to the Carabiner.
7. Connect a 60 foot counterpoise wire to the
Counterpoise Connection (i). Tighten the nut
(not supplied) snugly.
8. Connect a CHA RFI CHOKE and coaxial cable or
the Integrated RF Choke end of the CHA Coaxial
Cable assembly to the UHF Socket (g) on the
Hybrid Micro Base.
Raise the Antenna.
9. Using a throw weight or some other method,
loop the Paracord over the support.
10. Raise the center of the antenna to the desired
height and secure it to the support using a
Round Turn and two Half Hitches, or similar
knot.
Extend the Antenna.
11. Using a Bowline or similar knot, tie the end of a
short length (around 4 feet) of Paracord to the
Isolation Loop at the end of the Antenna Wire.
12. Fully extend the Antenna Wire until it is not
quite taut.
13. Drive a stake into the ground around two feet
from the end of the Antenna Wire and tie the
Paracord from the Antenna Wire to the stake
using two Half Hitches, or similar knot.
Extend the Counterpoise.
14. Using a Bowline, or similar knot, tie the end of a
short length of Paracord to the free end of the
counterpoise wire.
15. Fully extend the counterpoise wire, in an
opposite direction from the Antenna Wire, until
it is not quite taut.
16. Drive a stake into the ground around two feet
beyond the end of the counterpoise wire and tie
the Paracord from the end of the Antenna Wire
to the stake using two Half Hitches, or similar
knot.
17. Perform operational test.

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Inverted “L”
The CHA MPAS Inverted “L” configuration, see figure (6), is a broadband short to medium range HF antenna. This
configuration tends to be unidirectional, favoring the end of the horizontal part of the antenna. It is also provides
effective ground waves communication during the day time on frequencies between 1.8 –4.0 MHz without using
sky wave propagation. The Inverted “L” requires two supports and should be mounted at a height of 25 feet for
best performance. Though, it will provide good performance at a height of 10 to 20 feet, and is usable when
mounted as low as three feet. One counterpoise wire, with a length of 20 to 40 feet, is recommended. If a
counterpoise is not used, the coaxial cable must be 25 to 100 feet in length, as the shield of the coaxial cable
provides the counterpoise. Use the following procedure to install the Inverted “L” configuration.
Figure 6. Inverted “L”Configuration.
Site Selection and Preparation.
1. Select a site to deploy the CHA MPAS Inverted
“L” configuration. The site must have two
supports that will position the corner of the “L”
and the end of the Antenna Wire around 35 feet
apart at a height of about 25 feet. If the right
supports are unavailable, any convenient
objects, such as fence posts or the tops of
vehicles, may be used as a field expedient
supports with reduced performance.
Refer to plates (2) and (3) for steps (3) –(12).
2. If not already attached, connect a Carabiner (d)
to Isolation Loop (c) at the Wire Connector (f)
end of the Antenna Wire (b).
Connect the Hybrid Micro Base.
3. Temporarily remove the Antenna Shackle (j)
from the Antenna Connection (h).
4. Place the Wire Connector from the Antenna
Wire over the Antenna Connection and replace
the Antenna Shackle. Tighten the nut snugly.
5. Connect the Carabiner from the Antenna Wire
to the Antenna Shackle.
6. If using a counterpoise wire, connect it to the
Counterpoise Connection (i). Tighten the nut
(not supplied) snugly.
7. Connect a CHA RFI CHOKE and coaxial cable or
the Integrated RF Choke end of the CHA Coaxial
Cable assembly to the UHF Socket (g) on the
Hybrid Micro Base.

CHA HYBRID - MINI / MICRO Page 15
Raise the Antenna.
8. Using a Bowline or similar knot, tie the end of a
short length (around 4 feet) of Paracord to the
Carabiner.
9. Drive a Stake into the ground near the location
closest to the radio set and tie the Paracord
from the Hybrid Micro Base to the Stake using
two Half Hitches, or similar knot.
10. Using a Fisherman’s Hitch or similar knot, attach
a long length (50 feet or more) to the Antenna
Wire around 25 feet from the Hybrid Micro Base
(a). This will form the corner of the “L”
11. Using a throw weight or some other method,
loop the Paracord over the support closest to
the radio set.
12. Using a Bowline or similar knot, tie a long length
of Paracord to Isolation Loop at the end of the
Antenna Wire.
13. Using a throw weight or some other method,
loop the Paracord over the other support.
14. Pull the Paracord at the radio set end until the
Antenna Wire is at the desired height and
secure it to the support using a Round Turn and
two Half Hitches, or similar knot.
15. Pull the Paracord at the end of the Antenna
Wire, such that the Antenna Wire is not quite
taut, and secure it to the support using a Round
Turn and two Half Hitches, or similar knot.
Extend the Counterpoise.
16. If using a counterpoise wire, extend it along the
ground under the antenna.
17. Perform operational test.
Tilted NVIS
The CHA MPAS Tilted NVIS configuration, see figure (7), is a broadband short range HF/VHF-LO antenna. This is a
special configuration designed to provide good NVIS propagation on lower frequencies. It is predominately
omnidirectional and also provides medium range sky wave propagation on frequencies above 10 MHz. You can
mount it on a stationary vehicle which has a tilt-able 3/8” mobile antenna mount (not supplied) or any fixed
support on which you can clamp the CHA JAW MOUNT and will enable the antenna to be raised to a height of
around 10 feet. Using the optional CHA JAW MOUNT to create one of the supports, the Tilted NVIS antenna can be
mounted on almost anything, such as a camouflage netting support poles, fence post, tree limb, or the optional
Chameleon AntennaTM Tripod. The Antenna Wire (b) or a stationary vehicle are used as the counterpoise in this
configuration. An antenna tuner or coupler is required on most frequencies. The following procedure is used to
install the Tilted NVIS configuration.
Figure 7. Tilted NVIS.
Site Selection and Preparation
1. Select a site to deploy the CHA MPAS Tilted NVIS
configuration. The site must have a support
that will allow the antenna to be raised to a
height of around 10 feet and enough space for a
counterpoise at least 25 feet in length. A
stationary vehicle with a tilt-able 3/8” mobile
antenna mount is also satisfactory.
2. If using the CHA JAW MOUNT, clamp it to the
support.

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Refer to plates (2) through (4) for steps (3) –(8).
3. If attached, remove the Antenna Shackle (j)
from the Hybrid Micro Base (a) by loosening the
nut on the Antenna Shackle and then
unscrewing the Antenna Shackle from the
Antenna Connector (h). Store in a secure place.
Connect the Hybrid Micro Base.
4. If using a counterpoise wire, place the terminal
lug of the Antenna Wire over the Counterpoise
Connection on the Hybrid Micro Base.
Plate 4. CHA JAW MOUNT.
5. Screw the Hybrid Micro Base Counterpoise
Connection (i) into one of the 3/8” antenna
mount on the CHA JAW MOUNT or mobile
mount until finger tight.
6. Connect a CHA RFI CHOKE and coaxial cable or
the Integrated RF Choke end of the CHA Coaxial
Cable assembly to the UHF Socket (g) on the
Hybrid Micro Base. You will not be using the
UHF Socket (SO-239) on the 3/8” antenna
mount.
Raise the Antenna
7. Extend the CHA MIL EXT by unfolding the middle
section of the extension, fully seating it onto the
bottom section, then unfolding the top section
and fully seating onto the middle section.
8. Connect the CHA MIL EXT to the Hybrid Micro
Base by carefully screwing it into the Antenna
Connection until finger tight.
9. Extend the CHA MIL WHIP by unfolding the
sections of the whip, starting with the section
above the bottom section, and ensure each
section is fully seated onto section below until
the whip is fully extended.
10. Connect the CHA MIL WHIP to the CHA MIL EXT
by carefully screwing it into the top section until
finger tight.
Extend the Counterpoise.
11. If not using a vehicle as the counterpoise,
extend the counterpoise wire along the ground
in any convenient direction. The end of the
counterpoise wire can be secured to the ground
with a tent stake.
12. Perform operational test.
Recovery Procedure
To recover the CHA MPAS, perform the following steps:
1. Disconnect the Coaxial Cable from the radio set.
2. Lower the antenna to the ground or disconnect the Hybrid Micro Base (a) from the antenna mount.
3. Disconnect the Coaxial Cable from the Hybrid Micro Base.
4. Carefully roll (do not twist) the Coaxial Cable.
5. Disconnect, wind, and store the counterpoise wire(s), if used.
6. Untie the Paracord from the Hybrid Micro Base and Antenna Wire (b), as applicable and wind on line winder.
7. Disconnect the antenna from the Hybrid Micro Base.
8. Wind the Antenna Wire onto the Line Winder (e) and secure with attached shock cord.
9. CHA MIL EXT: Starting at the bottom, pull the section apart from the section above and fold the section above
over the section below. Repeat until all sections are apart. Secure the sections together with provided sticky
strap.
10. CHA MIL WHIP: Starting at the bottom, pull the section apart from the section above and fold the section
above over the section below. Repeat until all sections are apart. Secure the sections together with provided
sticky strap.
11. Pull the Stakes from the ground, if used.
12. Remove dirt from antenna components and inspect them for signs of wear.

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13. Store components together.
Troubleshooting
1. If using the Antenna Wire (b), ensure Wire Connector is securely connected.
2. Inspect Antenna Wire or Whip for breakage or signs of strain.
3. Ensure UHF Plugs are securely tightened.
4. Inspect Coaxial Cable assembly for cuts in insulation or exposed shielding. Replace if damaged.
5. If still not operational, connect a Standing Wave Ratio (SWR) Power Meter and check SWR.
6. If SWR is greater than 10:1, check antenna tuner or coupler using the technical manual or manufacturer’s
procedure. Be sure to check the Coaxial Patch Cable that connects the radio set to the antenna tuner or
coupler.
7. If still not operational, replace Coaxial Cable assembly. Most problems with antenna systems are caused by
the coaxial cables and connectors.
8. Connect a Multi-Meter to the Antenna Wire to check continuity. Replace assemblies that do not pass a
continuity check.
9. If still not operational, replace Hybrid Micro Base (a).
Specifications
Frequency: (all configurations require a wide range antenna tuner or coupler)
oCHA HYBRID MICRO: 1.8 MHz through 54 MHz continuous (including all Amateur Radio Service
bands 160m to 6m).
oCHA MIL WHIP: 24 –54 MHz (whip only), 1.8 –54 MHz (with CHA HYBRID MINI / MICRO. Limited
performance below 3.5 MHz.)
oCHA MIL WHIP with CHA MIL EXT: 12 –54 MHz (whip and extension only), 1.8 –54 MHz (with
CHA HYBRID MICRO.)
Power: CHA HYBRID MICRO: 50 W continuous duty cycle (CW, AM, FM, RTTY), 100 W intermittent duty
cycle (SSB and SSB-based digital modes)
RF Connection: UHF Plug (PL-259)
Length:
oAntenna Wire: 60 ft (maximum) and around 35 ft (minimum)
oCHA MIL WHIP: 10 ft 8 in extended, 29 in collapsed
oCHA MIL WHIP with CHA MIL EXT: 17 ft 4 in extended, 29 in collapsed
Weight:
oCHA HYBRID MICRO: 1 lbs
oCHA MIL WHIP: 1 lbs
oCHA MIL WHIP with CHA MIL EXT: 2 lbs
Personnel Requirements and Setup Time: one operator, less than 15 minutes (antenna wire), less than 5
minutes (whip).
MPAS Configuration Far Field Plots are shown in figures (9) through (16).
SWR: Subject to frequency and configuration, but within limits of most wide range antenna tuners or
couplers. Figure (8) shows a graph of SWR by frequency for a typical deployment.

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Figure 8. SWR by Frequency Graph.
Figure 9. Manpack Vertical Far Field Plots 7 MHz (left), 14 MHz (right).

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Figure 11. Portable Vertical Far Field Plots 7 MHz (left), 14 MHz (right).
Figure 12. Tilted NVIS Far Field Plots 3.7 MHz (left), 7 MHz (right).

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Figure 13. Horizontal NVIS Far Field Plots 3.7 MHz (left) 7 MHz (right).
Figure 14. Sloping Wire Far Field Plots 7 MHz (left) 14 MHz (right).