Light Beam Antenna LBM-17M+20M User manual

1
The Light Beam Multi-band Antenna
Model LBM - 17M+20M
Installation Instructions
Light Beam Multi-band Antenna Series
Model: LBM-17M+20M
W. A. Freiert – WB2LYL
The Light Beam Multi-band antenna is a compact, computer optimized, directional antenna with good gain and
excellent front to back ratio. The antenna has been optimized for operation at 30  above the ground.
Please read these Installation Instructions completely
before beginning installation of your antenna.
Check Your Delivery
Your Light Beam antenna has been shipped in one (1) box. Carefully
inspect the packaging for damage then unpack the antenna and note any
shipping damage. If any damage is found, contact the shipping carrier for
insurance coverage.
Parts Photographs
Boom Components Quantity
1.5” OD x 48” Tube 1
1.5” OD x 24” Tube 2
1.25” OD x 36” Tube 2
1.25” OD 0.058” x 36” Al. Tube 2
Note 1 1.125” OD 0.058” x 36” Al. Tube 2
1.0” OD x 48” Tube 2
1.0” OD 0.058” x 36” Al. Tube 1
0.75” OD x 12” Tube 2
0.5” OD x 12” Rod 2
Note 2 3/4”copper to 1/2” Elbow 2
Fig. 1
Note 1: The 1.125” Aluminum Tube is within the
1.250” Aluminum Tube.
Note 2: The Elbows and associated hardware
are pre-assembled in the 1.25” x 36” Fiberglass
Tubes.
Boom Components

2
Note 3: 1.0” OD x 24” Tube and 0.75” OD x 6” Rod are
within the 1.25” OD x 48” Tube
Fig. 2
Element Components Quantity
1.25” OD x 48” Tube 4
Note 3 1.0” OD x 24” Tube 4
Note 3 0.75” OD x 6” Rod 4
1.0” OD x 48” Tube 4
0.75” OD x 48” Tube 4
0.5” OD x 24” Rod 4
Spreader Components Quantity
0.75” OD x 48” Tube 2
0.5” OD x 48” Rod 4
Element Components
Spreader Components
Hardware
Components
Element
Mounting Plates
Element
Lanyards
Feed-line
Terminal Plate
Wire Elements
Hardware Components Quantity
10-24 x 2.0” SS Machine Screw 19
10-24 x 1.5” SS Machine Screw 8
10-24 x 1.0” SS Machine Screw 16
10-24 x 5/8” SS Machine Screw 2
10-24 SS Anti Vibration Hex Nut 45
10-24 Hex Nut w/Tooth Washer 4
No. 10 SS Flat Washer, .36” OD 25
¼ loop-1/4-20 x SS Eye bolt w/Nut 2
1/4-20 SS Anti-vibration Nut 2
1” SS Hose Clamp 4
3/4” SS Hose Clamp 8
1/8” - No. 10 Black Cable Clamp 13
Copper Elbows (Boom) & Hardware 2
Element Tube Lanyards Quantity
1/8” Dacron Cord 4
S.S. Lanyard Clamps 4
1/8” x 2” Heli-tube 8
No. 10 Ring Terminal 2
Plastic Plates Quantity
Element Mounting Plates
7.5” x 3.75” x 0.187” PC
4
Feed-line Terminal Plate 2.5”
x 1” x 0.187” PC
1
RF Wire Element Assembly Quantity
17M Driver Element (17D) 2
17M Reector Element (17R) 1
20M Driver Element (20D) 2
20M Reector Element (20R) 1
Balanced Feed, 17M to 20M 2
Fig. 3
Fig. 4

3
Tools Required
☐Tape Measure
☐ A 1/4” Nut Driver or Open end wrench
☐ A 5/16” Nut Driver or Open end wrench
☐ A 3/8” Nut Driver or Open end wrench
☐ #2 Phillips head screwdriver
☐ A 7/32” Nut Driver or Open end wrench
☐A 3/8” combination (box and open end) wrench
☐A 7/16” combination (box and open end) wrench
☐A 12” Carpenter Square
Assembly Overview
The Light Beam Multi-Band Antenna
Series, LBM-17M+20M is shipped
from our factory in a single box that
is less than 55 inches in length. This
has reduced your shipping expense.
Do not become intimidated by
the length of this instructions
document. We have provided very
detailed instructions with many
illustrative photographs to provide
clarity. The inclusion of many steps
in this document will ensure that
you will successfully assemble and
install your new antenna. Our goal is
to have the antenna work correctly,
the rst time out of the box.
The antenna is built in stages. Initial
sub-assembly can be completed indoors in the comfort of your workspace. Final assembly of the sub-assemblies to
create the nished antenna will be later completed outdoors near your tower site.
Step–by–Step Instructions
• As you progress – check o each step.
• Wear gloves and safety glasses.
• Use tools safely.
DANGER – Antenna Assembly
Failure to heed these warnings could result in
serious injury or death
While assembling your antenna you will be handling large structures. Caution must
be used when moving these assemblies. Be aware of your surroundings and move all
large assemblies slowly and with care.
Fig. 5

4
Boom Assembly
The Boom Assembly consists of three (3) sub-assemblies. Each sub-assembly can be built indoors on a large
workbench or table. The Boom assembly is a very strong laminated structure consisting of aluminum and
berglass tubes nested within each other. Holes within each tube must be carefully aligned to enable insertion of
all fasteners. Final assembly of the three sub-assemblies into the completed boom assembly must be performed
outdoors or in a large space.
☐Separate boom components identied in Fig. 1 from all other tubes and rods. See the image and list on p. 1.
Center Boom Sub-Assembly
☐ Select the 1.5” OD x 48” berglass tube and select
one 1.25” OD + 1.125” OD x 36” aluminum tube and
orient them as shown in Fig. 6.
☐Insert the aluminum tube within the right side of the
berglass tube as shown in Fig. 7. Align the holes
and insert a 10-24 x 2.0” machine screw and loosely
fasten (nger tight) using a 10-24 anti-vibration hex
nut.
☐With care, insert the 1.0” OD 0.058” x 36” aluminum
tube into the le side of the 1.5” OD x 48” berglass
tube while aligning the smaller aluminum tube
within the 1.25” OD aluminum tube installed in the
previous step.
DANGER – Antenna Installation
If you are installing your antenna on a roof, tower, or other high structure or will use a ladder or
scaold to access the installation location, follow these precautions to prevent personal injury or
death:
• Walk only on sound roof structures.
• Make sure the antenna assembly and installation surface are structurally sound so that they
can support all loads (equipment weight, ice, and wind).
• Use safety equipment (for example, a safety harness and lifeline) appropriate for the work
location.
• Perform as many procedures as possible on the ground. Do not attempt to assemble the
antenna on a roof or tower.
• To avoid electric shock, stay at least 20  from overhead and adjacent power lines.
• If any part of the antenna or mount assembly comes in contact with a power line, call the local
power company to remove it. Do not try to remove it yourself.
Failure to heed these warnings could result in
serious injury or death
Fig. 6
Fig. 7

5
☐Select the remaining 1.25” OD + 1.125” OD x 36” aluminum tube and carefully insert the tube into the le side
of the 1.5” OD x 48” berglass tube as shown in Fig.
8. Rotation of the larger tube may be required to
position the smaller aluminum tube to properly
nest within the larger aluminum tube being
inserted.
☐ Fully insert the aluminum tube within the le side
of the berglass tube as shown in Fig. 8. Align the
holes and insert a 10-24 x 2.0” machine screw and
loosely fasten (nger tight) using a 10-24 anti-
vibration hex nut.
This completes the Center Boom Sub-Assembly, Fig. 9. Place this sub-assembly aside for use later.
Fig. 8
Fig. 9
Boom End Sub-Assembly
The Front End of the Boom and the Back End of the Boom will be assembled in the following steps.
☐Select one of the 1.5” OD x 24” berglass tubes, one of the 1.250” OD x 36” berglass tubes with copper elbow
and one of the 1.0” OD x 48” berglass tubes. Orient the tubes as shown in Fig. 10. Note the alignment of the
holes and the relative position of each tube.
☐Insert the 1.0” x 48” berglass tube into the 1.25” OD x 36” berglass tube with copper elbow until all holes
align in both tubes.
☐Temporarily insert a 10-24 x 1.5” Machine Screw in the hole indicated by the arrow in Fig. 11.
☐Insert the 1.25” OD x 36” berglass tube with copper elbow into the 1.5” OD x 24” berglass tube until the
holes are aligned in all tubes as shown in Fig. 12.
Fig. 10
Fig. 11
Fig. 12

6
☐ Insert a 10-24 x 2.0” Machine Screw in the hole indicated in Fig. 13 and loosely fasten (nger tight) using a 10-
24 anti-vibration hex nut. Remove the temporary screw that was inserted in the previous step, see Fig. 11.
☐ Repeat the previous 5 Steps of the Boom End Sub-Assembly and build the other end of the Boom.
☐Position both Boom End Assemblies as shown in Fig. 14. Insert a 0.5”
OD x 12” Rod into the Copper elbow of each Boom End Assembly.
Note that this is a loose t.
Fig. 13
Fig. 14
Fig. 15
☐Insert a 1/4” -20 Eye-bolt
with 1/4”-20 Nut into
each of the 0.75” OD x
12” berglass tubes as
shown in Fig. 15. Fasten
the Eye-bolt to the tube
using a 1/4”-20 anti-
vibration Hex Nut.
☐Position the Eye-bolt
as shown in Fig. 16.
Tighten the anti-
vibration Hex Nut
until the tube deforms
slightly.
Fig. 16
• Place a 3/4” Stainless Steel Hose Clamp (the smaller of the two sizes of hose clamp.) over the slit-end of each
of the 0.75” OD x 12” berglass tubes as shown in Fig. 17. Tighten slightly.
Fig. 17

7
☐Place each of the tubes completed
in the previous step over the 0.5”
OD x 12” Rods as shown in Fig. 18.
Tighten the hose clamps.
This completes both Boom End Sub-
Assemblies. Place both aside with the
Center Boom Assembly as shown in
Fig. 19.
Element Assembly
The Element Assembly consists of four (4) Element Sub-Assemblies. All sub-assemblies are almost identical with
exception of the orientation of the hose clamps. This dierence will be discussed later within these instructions.
Each sub-assembly can be built indoors on a large workbench or table.
☐Separate the Element component tubes and rods
shown in Fig. 2 from other remaining tubes and
rods. See the list on Page 2.
☐ Insert the 1.0” OD x 48” berglass tube into the
1.25” OD x 48” berglass tube and align the holes as
shown in Fig. 20.
☐Insert a 10-24 x 1.5” Machine Screw and a 10-24 anti-
vibration nut as shown in Fig. 21. Tighten well.
☐Place the 1” Stainless Steel Hose Clamp (the larger
of the two sizes of hose clamp) over the slit-end of
a 1.0” OD x 48” berglass tube as shown in Fig. 22.
Note that the slit-end of the tube is positioned on
the right side end of the tube. Also note that the
hose clamp adjustment screw is above the tube.
☐Place a 3/4” Stainless Steel Hose Clamp (the smaller
of the two sizes of hose clamp.) over the slit-end of
a 0.75” OD x 48” berglass tube. Then insert the
0.75” OD tube into the 1.0” OD tube as shown in Fig.
23. Note the orientation of both hose clamps.
☐Slightly tighten both hose clamps.
Fig. 18
Fig. 19
Fig. 20
Fig. 21
Fig. 22
Fig. 23

8
☐Repeat the previous ve (5) steps and assemble a second element that is of the same orientation as the rst
Element assembled.
☐The remaining two (2) Elements are assembled
in a similar fashion as the previously assembled
Elements except the orientation is opposite. See
the following gures. See (Fig. 24 through Fig. 27)
Note: The slit-end of the tubes are positioned on the
le side end of each tube. Also note that the hose clamp
screws are above the tubes. Note the orientation of both
hose clamps.
☐Assemble the remaining two Elements as shown in
Fig. 24 through Fig. 27.
Complete the following steps for each of the four (4) 0.5” x 24” berglass rods.
☐Select a 10-24 x 1.0” SS Machine Screw, a 1/8” No. 10 Black Cable Clamp, and a 10-24
SS Anti-vibration Hex Nut. Insert the hardware through the hole of the berglass rod
as shown in Fig. 28.
☐Insert each completed rod sub-assembly into each element sub-assembly as shown
in Fig. 29.
The four (4) Element Sub-Assemblies are now complete as shown in Fig. 30.
Fig. 24
Fig. 25
Fig. 26
Fig. 27
Fig. 28
Fig. 29
Fig. 30

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Spreader Assembly
The Spreader Assemblies consist of two (2) identical sub-assembles. Each sub-assembly can be built indoors on a
large workbench or table.
☐Select the four (4) 0.5” OD
x 48” berglass rods as
shown in Fig. 31.
☐Select a quantity of two
(2) -- 10-24 x 1.0” SS
Machine Screws, two (2)
-- 1/8” No. 10 Black Cable
Clamps,and two (2) – 10-
24 SS Anti-vibration Hex
Nuts. Insert the hardware through the hole of the berglass rod as shown in Fig. 32.
☐ Repeat the previous step for the remaining three (3) berglass rods. Note that the Black Cable Clamp is on
the Hex Nut side of each fastener.
☐Place a 3/4” Stainless
Steel Hose Clamp (the
smaller of the two sizes
of hose clamp.) over the
slit-end of a 0.75” OD x
48” berglass tube. Then
insert the 0.0.5” OD berglass rod into the 0.75” OD tube as shown in Fig. 33. Tighten the hose Clamp slightly.
☐ Repeat the previous step for the remaining 0.75” OD x 48” berglass tube and berglass rod.
☐Insert the 0.5” OD x 48”
berglass rod into the
0.75” OD x 48” berglass
tube and align the holes
as shown in Fig. 34. Then
Insert a 10-24 x 1.0”
Machine Screw and a 10-24 anti-vibration nut. Tighten well. Note that the Black Cable Clamps should be
oriented on the same side of both berglass rods.
☐ Repeat the previous step for the remaining spreader sub-assembly.
This completes the assembly of the Spreader Sub-Assemblies as shown in Fig. 35.
Fig. 31
Fig. 32
Fig. 33
Fig. 34
Fig. 35

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Mounting the Element Sub-Assemblies to the Boom End Sub-Assemblies
A large at surface (5’ x 10’) is required for the following steps. This can be performed indoors if space permits.
During the following steps, the Element Mounting Plates and the Terminal Plate will be attached to the Boom
End Sub-Assemblies. In addition, the Element Sub-Assemblies will be oriented
correctly and then partially mounted to the Element Mounting Plates.
☐ Prepare all plastic plates by premoving the protective plastic lm from both
surfaces of the plates as shown in Fig. 36.
Driven Element Assembly
☐ Select either one of the Boom End Sub-Assemblies and temporarily remove
the tube and rod from the copper elbow as shown in Fig. 37.
☐Select one (1) of the Element Mounting Plates and insert two (2) 10-24 x 5/8”
Machine Screws as shown in Fig. 38. Fasten the screws using two (2) 10-24
Hex Nuts with Tooth Washer. Tighten both fasteners well. These fasteners
will later become terminals for the 20M Driven Element Wires.
☐Select two (2) 10-24 x 2” Machine screws and two (2)
No. 10 SS Flat washers. Place one washer on each
screw. Then insert the screws and washers through
the Element Mounting Plate that was prepared
during the previous step. Orient the Element
Mounting Plate as shown in Fig. 39. Then insert the
screws in the Boom End Assembly through the 1st
and 3rd holes as indicated in Fig. 39.
Note: The Hex Nuts with Tooth Washer of the Driven Element Terminals are oriented up, on the top surface of the
Element Plate and are the furthest distance from the copper elbow as shown in Fig. 40.
Fig. 36
Fig. 37
Fig. 38
Fig. 39
Fig. 40
1st hole
3rd hole

11
☐Select another Element Mounting Plate and position on the
bottom of the Boom End Sub-assembly, passing the screws from
the previous step through the bottom Element Mounting Plate as
shown in Fig. 41. Then place a No. 10 SS Flat Washer over each
screw and fasten each with a 10-24 Stainless Steel Anti-vibration
Hex Nut. Tighten both fasteners well.
☐Select the Feed-line Terminal Plate. Insert two (2) 10-24 x 1.0” Machine Screws and fasten
with two (2) 10-24 Hex Nuts with Tooth Washer as shown in Fig. 42. Tighten both fasteners
well.
☐Place a No. 10 SS Flat
Washer over a 10-24 x 2”
Machine Screw. Insert
that screw into the center
hole of the Feed-line
Terminal Plate. Orient
the Feed-line Terminal
Plate as shown and insert
the screw and plate
into the Boom End Sub-Assembly in the hole shown in Fig. 43. Fasten the machine screw with a 10-24 Anti-
vibration Hex Nut and tighten well.
☐ Place a No. 10 SS Flat Washer over each of two (2) 10-24 x 2.0” Machine
Screws. Insert the screws passing through both the top and bottom Element
Mounting Plates as shown in Fig. 44. Place a No. 10 Flat SS Washer and then
a 10-24 Anti-vibration Hex Nut over each screw. Tighten the fasteners nger-
tight.
Note: Two (2) of the Element Sub-Assembles will now be attached to the Boom
End Sub-assembly. Please refer to Fig. 30 and note that there are both le-hand
and right-hand Element Sub-Assembles.
☐ Select one (1) right-hand Element Sub-Assembly and one (1) le-hand Element Sub-Assembly.
☐Orient the selected Element Sub Assemblies next to the
Boom End Sub-Assembly as shown in Fig. 45. Note the
orientation of the Hose Clamp adjustment screws.
The Adjustment Screw of each Clamp is
oriented away from the Boom on the outer
side of each Element.
Fig. 41
Fig. 42
Fig. 43
Fig. 44
Fig. 45

12
☐Reposition the Element Sub-Assemblies and ensure
that the orientation is unchanged. Align the hole in each
Element Sub-Assembly with the holes in the top and
bottom Element Mounting Plates as shown in Fig. 46.
Fasten each Element Sub-Assembly to the Boom-End
Sub-Assembly by placing a No. 10 SS Flat Washer over a
10-24 x 2.0” Machine Screw, then pass the screw through
the top mounting plate, the element, then the bottom
mounting plate. Place a No. 10 SS Flat Washer and then a
10-24 Anti-vibration Hex Nut over each screw. Tighten the
fasteners nger-tight.
☐Secure the ends of both Element Sub-Assemblies together using an elastic
band as shown in Fig. 47.
This completes the assembly of the Driven Element Assembly. The Driven
Element Wires will be added to this assembly during the nal assembly of the
antenna.
Note: The orientation of all Hose Clamp Adjustment Screws. They are positioned on the outer side of each
element, facing up.
Reector Element Assembly
☐ Select the remaining Boom End Sub-Assembly and temporarily remove the
tube and rod from the copper elbow as shown in Fig. 48.
☐ Select an Element Mounting Plate and position over the Boom End Assembly as shown in Fig. 49. Then select
one (1) 10-24 x 2” Machine screw and one (1) No. 10 SS Flat washer. Place the washer on the screw. Then
insert the screw and washer through the top Element Mounting
Plate. Insert the screw in the Boom End Assembly through the
2nd hole as indicated in Fig. 49.
Fig. 46
Fig. 47
Driven Element Assembly
Fig. 48
Fig. 49

13
☐Position the remaining Element Mounting plate on the
bottom of the Boom End Sub-Assembly. Pass the screw
installed during the previous step through the hole in this
plate as indicated in Fig. 50. Then place a No. 10 SS Flat
Washer over the screw and fasten with a 10-24 SS Anti-
vibration Hex Nut. Tighten Finger tight.
☐Select one (1) 10-24 x 2” Machine screw and one (1) No.
10 SS Flat washer. Place the washer on the screw. Then
insert the screw and washer through the bottom Element
Mounting Plate. Insert the screw in the Boom End Sub-
Assembly through the 4th hole as indicated in Fig. 50.
☐ Select a No. 10 Flat washer and place it over the screw
that was installed during the previous step as shown in
Fig. 51. Then place a No. 10 Black Cable Clamp and a
10-24 SS Anti-vibration Hex Nut on the screw. Tighten the
fastener nger-tight.
☐ Place a No. 10 SS Flat Washer over each of two (2) 10-24 x 2.0” Machine
Screws. Insert the screws passing through both the top and bottom Element
Mounting Plates as shown in Fig. 52. Place a No. 10 Flat SS Washer and then
a 10-24 Anti-vibration Hex Nut over each screw. Tighten the fasteners nger-
tight.
☐Orient the selected Element Sub Assemblies next to the
Boom End Sub-Assembly as shown in Fig. 53. Note the
orientation of the Hose Clamp adjustment screws.
☐Reposition the Element Sub-Assemblies and ensure that the
orientation is unchanged. Align the hole in each Element Sub-
Assembly with the holes in the top and bottom Element Mounting
Plates as shown in Fig. 54. Fasten each Element Sub-Assembly to
the Boom-End Sub-Assembly by placing a No. 10 SS Flat Washer
over a 10-24 x 2.0” Machine Screw, then pass the screw through the
top mounting plate, the element, then the bottom mounting plate.
Place a No. 10 SS Flat Washer and then a 10-24 Anti-vibration Hex
Nut over each screw. Tighten the fasteners nger-tight.
Fig. 50
Fig. 51
Black Cable Clamp
Fig. 52
Fig. 53
Fig. 54

14
☐Secure the ends of both Element Sub-Assemblies together using an elastic
band as shown in Fig. 55. This completes the assembly of the Reector
Element Assembly. The Reector Element Wires will be added to this
assembly during the nal assembly of the antenna.
All Sub-Assemblies are complete
Final Assembly and Installation
Final assembly of your new Light Beam Multi-band (LBM) antenna will need to be completed outdoors on a level
surface such as a driveway or patio. A 15’ x 26’ area is required. If assembly is to take place on a lawn or other
rough surface, a large tarp is recommended. Using a tarp will enhance the retrieval of parts that are accidentally
dropped.
☐Carefully carry the Assemblies shown in Fig. 56 to your new work location. Also move all other remaining
antenna parts such as remaining hardware, RF Wire Assemblies and Lanyards.
☐Place the Driven Element Assembly at one end of the outdoor work area.
☐ Remove the Elastic Band that is holding the Element ends together.
☐Remove the two (2) fasteners that are indicated in Fig. 57.
☐Swing one of the Elements till it is perpendicular to the Boom End
Assembly, align the hole in the Element with the holes in the Element
Mounting Plates and re-insert one (1) of the fastners previously
removed. Do not tighten. See Fig. 58.
Fig. 55
Center Boom
Driven Element
Reector Element
Spreader Assemblies
Fig. 56
Fig. 57
Fig. 58

15
☐Using a carpenter’s square, verify that the position of
the Element Assembly is perpendicular to the Boom End
Assembly. Then tighten the fastener very well. See Fig.
59.
☐ Repeat the previous two (2) steps to position and fasten
the other Element Assembly. See Fig. 60.
☐ Tighten all 6 fasteners very well.
This completes the Driven Element Assembly. Place the
Reector Element Assembly in the outdoor workspace.
☐ Repeat the steps previously used to position the
elements of the Driven Element Assembly to position the
elements of the Reector Element Assembly. Verify that
the elements are square with the Boom End Assembly.
Tighten all six (6) fasteners well. See Fig. 61.
☐Place the Boom Center Assembly near the Driven Element
Assembly. Align the holes in each as shown in Fig. 62.
☐ Remove the fastener shown in Fig. 62.
Fig. 59
Fig. 60
Fig. 61
Fig. 62

16
☐ Insert the small berglass
tube of the Driven
Element Assembly Into
the aluminum tube of the
Boom Center Assembly as
shown in Fig. 63.
☐ Align all holes and re-insert the fastener removed in the
previous step. Also insert one (1) 10-24 x 2.0” SS machine
screw in the Driven Element Assembly Boom End as
shown in Fig. 64. Add a 10-24 Anti-vibration Hex Nut to
each machine screw.
Note: A small space may remain between the outside tubes of
the Boom Assembly. This space is acceptable.
☐Tighten each fastener well.
☐Place the Reector Element Assembly near the Boom Center Assembly and Driven Element Assembly. Repeat
the previous four (4) steps to fasten the Reector Element Assembly to the Boom.
☐Tighten each fastener well.
This completes the
attachment of the Driven
Elements and the Reector
Elements to the complete
Boom structures.
Note: The following steps set the initial starting length of the Elements. This initial length setting will change later
when the Element Wires are properly tensioned.
☐Select one of the
elements and extend the
end of the 0.5” OD Rod
to a length of 17.0” as
shown in Fig. 65. Tighten
the 3/4” SS Hose Clamp.
☐ Repeat the previous step
for each one of the remaining three (3) elements.
Fig. 63
Fig. 64
Fig. 65
17.0”

17
☐Select one of the
elements and extend the
end of the 0.75” OD Tube
to a length of 41.0” as
shown in Fig. 66. Tighten
the 1.0” SS Hose Clamp.
☐ Repeat the previous step
for each one of the remaining three (3) elements.
☐Select both of the two (2) Spreader Assemblies and place them in the workspace. Loosen the 3/4” SS Hose
Clamp on one of the
Spreader Assemblies and
extend the 0.5” OD Rod to a
length of 38.0” as shown in
Fig. 67. Tighten the 3/4” SS
Hose Clamp.
☐ Repeat the previous step
for the remaining Spreader
Assembly.
☐Select one of the Spreader Assemblies and position it to
span both elements on one side of the Boom. Align the
hole in the end of the Spreader Assembly with the hole in
the 0.75” OD Tube of an Element Assembly. Select a 10-24
x 1.5” SS Machine Screw and insert the screw through the
bottom of the Element Assembly then through the end
of the 0.5” OD Rod of the Spreader Assembly as shown in
Fig. 68. Fasten with a 10-24 Anti-vibration Nut. Tighten
well.
☐ Position the Spreader Assembly to be parallel with the Boom Assembly. Repeat the previous step to attach
the other end of the same Spreader Assembly to the opposite Element Assembly.
☐ Repeat the previous two (2) steps and attach the remaining Spreader Assembly to the Elements of the other
side of the antenna as shown in Fig. 69.
Note: The following steps will result in the RF Wire Assemblies being
attached to the completed antenna support structure of Fig. 69.
☐Select the two (2) wires that form the Balanced Feed-line that
connects the 17M Elements to the 20M Elements. Place the wire lugs
over the terminals as shown in Fig. 70. Place one of four (4) 10-24 SS
Hex Nuts over each terminal. Tighten well.
Fig. 66
41.0”
Fig. 67
38.0”
Fig. 68
Element Assembly
Spreader Assembly
Element Assembly
Boom Assembly
Fig. 69
Fig. 70

18
☐Select the Wire
Assembly that is
labeled 17R. This
is the 17M Reector
Element. Carefully
unwrap the wire
bundle. Note that
the wire is folded
back upon itself at
both ends. These
are the outside ends
of the element.
Where the wire is
folded back upon
itself, this is the point on the wire where the Black Cable Clamp is located.
At the Reector End of the antenna, temporarily remove the 10-24 SS Anti-
vibration Hexnut and Black Cable Clamp, then insert the wire as shown in Fig.
71. Replace the Black Cable Clamp with wire and the Hex Nut on the Machine
Screw and tighten well. Position the Black Cable Clamp as shown in Fig. 72.
☐At the other end of the wire from the
previous step, repeat the previous
step to fasten the wire within the
Black Cable Clamp located on
the other side of the Boom at the
Reector End of the antenna as
shown in Fig. 73.
This completes the installation of the 17M
Reector Element. The loose ends of the
element will be secured in a later step.
☐Select one (1) of the two (2)
Wire Assemblies that is labeled
17D. This is a 17M Driven
Element. Carefully unwrap
the wire bundle. Note that the
wire is folded back upon itself
at one end. This is the outside
end of the element. Connect
the ring terminal on the other
end of the wire and position it
at the terminal plate as shown
in Fig. 74. Remove the 10-24
SS Anti-vibration Hex Nut,
place the ring terminal over
the machine screw and replace
the Hex Nut. Tighten well.
Fig. 71
Fig. 72
Fig. 73
Fig. 74

19
☐At the Driven End of the antenna,
temporarily remove the 10-24 SS
Anti-vibration Hex Nut and Black
Cable Clamp, then insert the wire.
Replace the Black Cable Clamp with
wire and the Hex Nut on the Machine
Screw and tighten well. Position the
Black Cable Clamp as shown in Fig.
75.
☐ Twist the driven and reector
element wires to remove curl from
each wire.
☐Pass the black cord that is attached
to the ring terminal of the 17M
Driven Element Wire through the
ring terminal of the 17M Reector
Element wire as shown in Fig.
76. Pull the cord through the ring
terminal till the wire tie is against
the ring terminal, then secure this
position with a knot.
☐Select one (1) of the 1/8” x 2” Heli-
tubes and wrap the spiral tube
about the cord as shown in Fig. 77.
☐Completely wrap the cord with the
spiral tube as shown in Fig. 78.
☐Select the remaining Wire Assembly that is labeled 17D. Repeat the previous six (6) steps to install the other
17M Driven Element.
This completes the installation of the 17M Driven Elements.
Fig. 75
Fig. 76
Fig. 77
Fig. 78

20
☐Select the Wire Assembly
that is labeled 20R. This is
the 20 M Reector Element.
Carefully unwrap the wire
bundle. Note that the wire
is folded back upon itself at
both ends. These are the
outside ends of the element.
Where the wire is folded back
upon itself, this is the point
on the wire where the Black
Cable Clamp is located. At the
Reector End of the antenna,
temporarily remove the two
(2) 10-24 SS Anti-vibration Hex
Nuts and Black Cable Clamps,
then insert the wire in both
as shown in Fig. 79. Replace the Black Cable Clamps with wire and the Hex Nuts on the Machine Screws and
tighten well. Position the Black Cable Clamps as shown in Fig. 79.
☐At the other end of the wire from the
previous step, repeat the previous
step to fasten the wire within the
Black Cable Clamps located on
the other side of the Boom at the
Reector End of the antenna as
shown in Fig. 80.
☐ On the Reector Element end of the
Boom, locate the Black Cable Clamp
as shown in Fig. 81. Temporarily
remove the 10-24 SS Anti-vibration
Hex Nut and Black Cable Clamp,
then insert the wire. Replace the
Black Cable Clamp with wire and the
Hex Nut on the Machine Screw and
tighten well.
This completes the installation of the 20M Reector Element.
Fig. 79
Fig. 80
Cable Clamps
Cable Clamps
Fig. 81