SteppIR MonstIR User manual

MonstIR
INSTALLATION INSTRUCTIONS
Revision 08/04/08
SteppIR Antennas
2112 - 116th Ave NE, Suite 2-5 - Bellevue, WA 98004
Tel: [phone] Fax: [phone]
Tech Support: 425-891-6134
www.steppir.com

Abbreviations
EHT Element Housing Tube
EHU Element Housing Unit
EST Element Support Tube (pole)
FCC Flexible Connection Coupler (rubber)
EST
EHU
EHT
FCC
SteppIR Antenna Information Web Sites (as of 4/09/07)
http://steppir.com/
http://groups.yahoo.com/group/steppir/
SteppIR Antennas — MonstIR 2

SteppIR - Why Compromise?
The SteppIR antenna was originally conceived to solve the problem of covering the
six ham bands (20m, 17m, 15m, 12m, 10m and 6m) on one tower without the per-
formance sacrifices caused by interaction between all of the required antennas.
Yagis are available that cover 20 meters through 10 meters by using interlaced ele-
ments or traps, but do so at the expense of significant performance reduction in gain
and front to back ratios. With the addition of the WARC bands on 17m and 12m, the
use of interlaced elements and traps has clearly been an exercise in diminishing re-
turns.
Obviously, an antenna that is precisely adjustable in length while in the air would
solve the frequency problem, and in addition would have vastly improved perform-
ance over existing fixed length Yagis. The ability to tune the antenna to a specific
frequency, without regard for bandwidth, results in excellent gain and front to back at
every frequency.
The SteppIR design was made possible by the convergence of determination and
high tech materials. The availability of new lightweight glass fiber composites, Teflon
blended thermoplastics, high conductivity copper-beryllium and extremely reliable
stepper motors has allowed the SteppIR to be a commercially feasible product.
The current and future SteppIR products should produce the most potent single
tower antenna systems ever seen in Amateur Radio! We thank you for using our
SteppIR antenna for your ham radio endeavors.
Warm Regards,
Mike Mertel
Michael (Mike) Mertel - K7IR
President
SteppIR Antennas — MonstIR 3

SteppIR Design
Currently, most multi-band antennas use traps, log cells or interlaced elements as a means to cover sev-
eral frequency bands. All of these methods have one thing in common–they significantly compromise
performance. The SteppIR™ antenna system is our answer to the problem. Yagi antennas must be
made a specific length to operate optimally on a given frequency.
So, instead of trying to “trick” the antenna into thinking it is a different length, or simply adding more
elements that may destructively interact, why not just change the antenna length? Optimal perform-
ance is then possible on all frequencies with a lightweight, compact antenna. Also, since the SteppIR
can control the element lengths, a long boom is not needed to achieve near optimum gain and front to
back ratios on 20 - 10 meters.
Each antenna element consists of two spools of flat copper-beryllium tape conductor (.54” Wide
x .008” Thick) mounted in the element housing unit. The copper-beryllium tape is perforated to allow
a stepper motor to drive them simultaneously with sprockets. Stepper motors are well known for their
ability to index very accurately, thus giving very precise control of each element length. In addition,
the motors are brushless and provide extremely long service life.
The copper-beryllium tape is driven out into a hollow fiberglass elements support tube (see below),
forming an element of any desired length up to the limit of each specific antenna model (a vertical uses
only one side). The fiberglass elements support tubes (poles) are telescoping, lightweight and very du-
rable. When fully collapsed, each one measures approximately 57” in length. Depending on the
model, there may be additional extensions added to increase the overall element length.
The ability to completely retract the copper-beryllium antenna elements, coupled with the collapsible
fiberglass poles makes the entire system easy to disassemble and transport.
The antenna is connected to a microprocess
or-based controller (via 22 gauge conductor cable)
that offers numerous functions including dedicated buttons for each ham band, continuous
frequency selection from 80m to 6m (depending on the model). There are also 17 ham and 6
non-ham band memories and you can select a 180° direction reversal* or bi-directional*
mode and it will adjust in just about 3 seconds (* Yagi only).
Boom
Element Housing Unit
Element Support Tube
Stepper Drive Motor
Copper Beryllium Tape
Copper-Beryllium Tape
SteppIR Antennas — MonstIR 4

SteppIR Antennas — MonstIR 5
JÜRG DR. REGLI (HB9BIN)
SWITZERLAND

Table of Contents
Topic
Abbreviations 2
Why Compromise 3
SteppIR Design 4
Table of Contents 6
Parts List 7
Word of Caution 12
Installing Boom to Mast 13
Boom Assembly 15
Element Bracket Assembly 18
Install the Boom Truss 22
Element Truss Assembly 25
Assemble 70’ Elements 26
Wiring Elements 30
Prepare the Telescoping Fiberglass Element Support Tubes (EST) 35
Installing the Fiberglass Element Support Tubes (EST) 38
Installing Element Trusses 39
6m Passive Element Installation (Optional) 40
SteppIR Performance Topics 42
SteppIR Warranty 45
Page
SteppIR Antennas — MonstIR 6
HB9BIN Assembly Crew

SteppIR Antennas — MonstIR 7
ITEM QTY PART NUMBER DESCRIPTION
IN BOX 1 1 MonstIR INSTALLATION MANUAL
1 72-0009-03 GLUE KIT (CPVC - PRIMER / GLUE)
1 OPERATORS MANUAL
2 SteppIR STICKERS
1 40M ELEMENT HOUSING UNIT (DRIVEN)
2 40M ELEMENT HOUSING UNIT (PASSIVE)
1 16 CONDUCTOR CONTROL CABLE
BRACKET ASSEMBLY
3 10-1405-01 ELEMENT SUPPORT PLATE (FOR 40m ELEMENTS)
3 70-1414-11 TRUSS ASSY, ELEMENT SUPPORT (“A” FRAME)
3 10-1416-L TRUSS ASSY, ELEMENT CENTER SUPPORT (LEFT)
3 10-1416-R TRUSS ASSY, ELEMENT CENTER SUPPORT (RIGHT)
MAST PLATE ASSEMBLY
2 10-1021-31 15” x 15” MAST PLATE
4 60-0027 1/4-20 x 1” SS BOLT
4 60-0030 1/4-20 SS NYLOK NUT
BOOM TRUSS MAST — ASSEMBLED & STRETCH-WRAPPED
1 10-1430-01 BOOM TRUSS MAST (1-3/4 x 32”)
1 60-0065 5/16-18 x 3-1/2" SS BOLT
4 60-0034 5/16" WASHER
1 60-0046 5/16-18 SS NYLOK NUT
2 60-0070 3/8-16 x 6” GALVANIZED TURNBUCKLE (BOOM TRUSS)
ITEM QTY SIZE DESCRIPTION
BOX 1 1 36x19x12 ELEMENT BOX
BOX 2 1 19x19x6 MASTER PLATE BOX
BOX 3 1 60x3x6 TELESCOPING POLE BOX
BOX 4 1 81x11x7 BOOM BOX
BOX 5 1 108x6x4 FIBERGLASS POLE BOX
BOX 6 1 108x6x4 FIBERGLASS POLE BOX
BOX 7 1 60x3x6 OPTIONAL 6M PASSIVE BOX
BOX 8 + ? ? ANYTHING ADDITIONAL

SteppIR Antennas — MonstIR 8
ITEM QTY PART NUMBER DESCRIPTION
IN BOX 1
MAST PLATE ASSEMBLY
BAG 1 72-0010-01
1 60-0085 3/8-24 x 3” SS THREADED BOLT
3 60-0050 3/8-24 SS NYLOK NUT
4 60-0034 3/8" SS WASHER
BAG 2 72-0010-02
2 60-0007 2-3/4" U-BOLT & SADDLE
4 60-0050 3/8-24 SS NYLOK NUT
BAG 3 72-0010-03
2 1-3/4” U-BOLT (3-5/8” LONG REACH)
2 1-3/4" U-BOLT SADDLE
4 60-0046 5/16" SS NYLOK NUT
BAG 4 72-0010-04
16 60-0045-14 1/4” WIRE CLIP (FOR PHILLYSTRAN - BOOM TRUSS)
4 60-0073 5/16” THIMBLE
4 60-0044-20 1/4” PLASTIC END CAPS (FOR PHILLYSTRAN)
BAG 5 72-0010-05
1 10-1102-21 CONTROL WIRING TERMINAL PROTECTIVE HOUSING
2 60-6000-40 HOSE CLAMP (4”)
2 20-6016-8 8 - POSITION TERMINAL STRIP
1 20-6016-1 1 - POSITION TERMINAL STRIP
2 10-1029-01 CONNECTOR PROTECTOR (CREAM - IN BLUE POUCH)
BAG 6 72-0010-06
4 10-1421-01 2" SADDLE (SOLID) - WITH CENTER HOLE
4 60-0072 #10-32 x 1” SS PAN-HEAD SCREW
4 60-0019 #10-32 SS NYLOK NUT
4 2" U-BOLT ONLY (4” LONG REACH)
8 60-0046 5/16-18 SS NYLOK NUT
IN BOX 1 1 60-0035-10 3/8” x 151" PHILLYSTRAN (FOR BOOM TRUSS)
1 60-0035-10 3/8” x 164” PHILLYSTRAN (FOR BOOM TRUSS)

SteppIR Antennas — MonstIR 9
ITEM QTY PART NUMBER DESCRIPTION
IN BOX 1
POLE ASSEMBLY HARDWARE
BAG 1 72-0012-01
6 10-1114-01 COUPLER (3/4" CPVC)
BAG 2 72-0012-02
12 10-1429-21 ELEMENT TRUSS CLAMP HALF
24 60-0027 1/4-20 x 1” SS BOLT
24 60-0030 1/4-20 SS NYLOK NUT
BAG 3 72-0012-03
6 60-0004-01 2" U-BOLT (3.5” LONG REACH) w/ SADDLE
12 60-0046 5/16-18 SS NYLOK NUT
BAG 4 72-0012-04
6 60-1006-01 QUICK DISCONNECT BOOT (1.5" TO 1.25") (FERNCO)
BAG 5 72-0012-05
2 60-1006-01 QUICK DISCONNECT BOOT (1.5" TO 1.25") (FERNCO)
6 60-1006-21 QUICK DISCONNECT BOOT (1.5" TO 1.25") (MISSION)
BAG 6 72-0012-06
2 09-0003 SILICONE TAPE (20-FT ROLL)
1 09-0004 SILICONE TAPE (10 FT ROLL)
2 09-0001 ELECTRICAL TAPE (3/4” x 66’ ROLL)
6 60-0008 #2 x .25 COUPLER SCREW (INSTALLS AT THE HOUSING)
BOOM ASSEMBLY HARDWARE
72-0015-03 BOOM TRUSS MAST ASSEMBLY
BAG 3 60-0037 5/16-18 x 4-3/8” GALVANIZED EYEBOLT
1 ANTI-SEIZE (IN SYRINGE)
3 60-0067 3/8-16 x 4-1/4” SS BOLT
3 60-0050 3/8-16 NYLOK NUT
60 60-0041 1/4” FLAT WASHER
9 60-0091 1/4-20 x 3-3/4” SS BOLT
6 60-0100 1/4-20 x 3-1/2” SS BOLT
15 60-0030 1/4-20 SS NYLOK NUT
3 60-0046 5/16-18 NYLOK NUT
6 60-0034 3/8” FLAT WASHER

SteppIR Antennas — MonstIR 10
ITEM QTY PART NUMBER DESCRIPTION
IN BOX 2 1 20M ELEMENT HOUSING UNIT (PASSIVE)
1 CONTROLLER
1 POWER SUPPLY (FOR CONTROLLER)
1 “T” SHIRT (FOR YOU)
BRACKET HARDWARE
BAG 1 72-0011-01
12 10-1406-11 2-1/8” SADDLE (MACHINED SOLID-SHORT)
12 60-0067 3/8-16 x 4-1/4” SS BOLT
12 60-0050 3/8-16 SS NYLOK NUT
BAG 2 72-0011-02
12 10-1406-21 2-1/8” SADDLE (MACHINED SOLID-TALL)
12 60-0067 3/8-16 x 4-1/4” SS BOLT
12 60-0050 3/8-16 SS NYLOK NUT
BAG 3 72-0011-03
18 60-0068 1/4-20 x 1” SS FLATHEAD PHILLIPS SCREW
3 60-0053 1/4-20 x 2.5” SS BOLT
6 60-0078 1/4-20 x 1.75” SS BOLT
27 60-0030 1/4-20 SS NYLOK NUT
12 60-0034 1/4” SS WASHER
BAG 4 72-0011-04
6 60-0083 1/4-20 x 4” SS TURNBUCKLE (FOR ELEMENT TRUSS)
BAG 5 72-0011-05
6 60-0035 3/16” x 14’ PHILLYSTRAN (FOR ELEMENT TRUSS)
BAG 6 72-0011-06
48 60-0045 3/16” WIRE CLIP (FOR PHILLYSTRAN - ELEMENT TRUSS)
12 60-0048 3/16” THIMBLE
12 60-0044 3/16” PLASTIC END CAP (FOR PHILLYSTRAN)
BAG 7 72-0011-07
8 60-0061 #10-32 x 7/8” PAN-HEAD PHILLIPS SCREW
18 60-0072 #10-32 x 1-1/4” PAN-HEAD PHILLIPS SCREW
16 60-0017 #10-32 x 3/4” PAN-HEAD PHILLIPS SCREW
26 60-0018 #10 SS WASHER
42 60-0019 #10-32 SS NYLOK NUT
IN BOX 3 8 10-1013-01 TELESCOPING POLE (18 FOOT - 4 SEGMENT - FIBERGLASS)

SteppIR Antennas — MonstIR 11
ITEM QTY PART NUMBER DESCRIPTION
IN BOX 4
BOOM ASSEMBLY
72-0024-05 BOOM ASSEMBLY (6 PRE-ASSEMBLED SUB-SECTIONS)
NOTE: MOST HARDWARE BELOW IN PRE-ASSEMBLED SUB-ASSEMBLIES
2 10-1425-01 2.75" x 72” SECTION
2 10-1426-01 2.5" x 72” SECTION (END)
1 10-1426-11 2.5" x 72” SECTION
1 10-1426-21 2.5" x 63” SECTION
2 10-1428-01 2.25" SPLICE
1 10-1427-01 2.5" SPLICE (CENTER)
1 10-1017-51 BRACKET (FOR 20m PASSIVE)
3 10-1404-01 BRACKET (FOR TRUSS ASSEMBLY)
9 60-0067 3/8-16x4 1/4” SS BOLT
9 60-0050 3/8-16” SS NYLOK NUT
6 60-0029 1/4-20 x 3” SS BOLT
12 60-0063 1/4-20 x 3-1/4” SS BOLT
2 60-0032 1/4-20 x 3-1/2” SS BOLT (20m BRACKET)
11 60-0030 1/4-20” SS NYLOK NUT
2 10-1430 2.5-MIR BOOM COUNTERWEIGHT
5 60-0091 1/4-20x 3/4” SS BOLT
IN BOX 5&6 ==> ** BOX 5 & 6 HAVE IDENTICAL CONTENTS **
2 in. FIBERGLASS TUBE ASSEMBLY
6 10-1408-02 FIBERGLASS ELEMENT SUPPORT TUBE
6 10-1407-11 ELEMENT PROTECTION SLEEVE (2.1” x 3.75” ALUMINUM)
6 10-1407-21 ELEMENT PROTECTION SLEEVE (2.1” x 2” ALUMINUM)
6 10-1409-01 SPLICE (2” TO 1.75”)
1.75” FIBERGLASS TUBE ASSEMBLY
6 10-1411-01 1.75” x 99” FIBERGLASS ELEMENT SUPPORT TUBE
6 10-1410-01 SPLICE (1.75” TO 2”)
6 10-1034-21 EST RING (.4”)
6 10-1412-02 ELEMENT GUIDE INNER (3/4” x 105.5” CPVC W/COUPLER)
6 10-1413-01 ELEMENT GUIDE CHAMFERED (3/4” x 102” CPVC)
IN BOX 7 1 6-METER PASSIVE KIT - LONG (112.0”) (OPTIONAL)
1 6-METER PASSIVE KIT - SHORT (104.5”) (OPTIONAL)
36 60-0041 1/4” FLAT WASHER
12 60-0100 1/4-20x3 1/2” SS BOLT
9 60-0102 3/8-16x3/4 TYPE FTCS BLACK OXIDE BOLT
18 60-0034 3/8 FLAT WASHER

SteppIR Antennas — MonstIR 12
Word of Caution
Be Careful to avoid making contact with power lines or
other potential hazards when constructing, moving and
installing the antenna, as you could be seriously injured or
even killed if a metal object comes in contact with high
voltage.
Assembling the Antenna
It is highly recommended that you read these assembly instructions in their entirety before
assembling the antenna. Doing so will provide you an overall idea of what needs to be done
and helps avoid making time-consuming mistakes. Building your SteppIR is a
straightforward process. It entails:
●Lubricate all fasteners ¼” or larger with anti-seize grease (in syringe)
●Determine how you will raise the antenna.
●Assembling the boom-to-mast plate and mounting it to a temporary mast.
●Assembling the boom.
●Attach the boom to the boom-to-mast plate.
●Assemble three large element brackets.
●Attach four element housings and routing control lines.
Methods to Raise the Antenna
The MonstIR is to be raised with the boom to mast plate attached. To facilitate easy
attachment to the mast on the tower the 2” u-bolt saddles are bolted to the mast plate so all
you have to do is slip on the four u-bolts and install the nylock nuts. The boom truss is
supported by a provided 1 ¾” O.D. x 32” aluminum tube that is attached with u-bolts to the
mast plate. This allows you to mount the antenna at the very top of your mast and raise the
antenna completely assembled. There are many ways to raise an antenna so this is just a
suggestion, however we have found it to work very well. So if you like our method, follow
the instructions as they appear.

SteppIR Antennas — MonstIR 13
Installing Boom to Mast
●Erect a temporary mast that is about 4 feet tall to build the antenna on.
Picture 1 shows one of many
ways to tempo- rarily mount the mast
during assem- bly. We strongly rec-
ommend against building it lay-
ing flat on the ground. You will ding
up the element housings and you won’t
be able to ad- just the trusses cor-
rectly. The mast must be strong
enough to hold the 260 lb antenna
safely, even when it is slightly un-
balanced. You could use one leg of
your tower if you have adequate
room around it or bury a 2” pipe about
3 feet into the ground and pack soil tightly around it.
The mast plate consists of two identical pieces, each 15” x 15” x .250” thick and
comes already bolted together. The mast plate has 33 pre-drilled holes. The four 2”
u-bolt holes are used to secure the antenna to the mast on your tower. The optional
pilot holes are there in the event you are using a 2-1/2” mast. If you are using a 2”
mast, these holes are left unused. The two 2¾” u-bolts are used for attaching the
boom to the mast plate. (Picture 2 & Picture 3)
• The Ez-eye is shown highlighted in Picture 3, near the middle of the mast plate.
This system serves two purposes;
• The primary purpose is to positively secure the boom to the mast plate prevent-
ing any rotation of the boom during high winds.
• The second is to allow precise leveling of the antenna before tightening the 2 ¾”
u-bolts that secure the boom.
See Picture 4 and Picture 4.1 for details on mounting the 3/8”x3” bolt, the three 3/8”
Nylok nuts, and the four 3/8” flat washers. Install just the 3/8”x3” bolt as shown be-
fore mounting the mast plate to the temporary mast.
Picture 1

SteppIR Antennas — MonstIR 14
Picture 2
2” U-Bolt Saddles
Picture 3 2” Mast
1-3/4” Truss Mast
EZeye
Adjust
2-3/4” Boom
U-bolts
Attach the Boom-to-Mast Plate to the Temporary Mast
NOTE: Take the time now to make sure all of the 2” u-bolts will easily fit the mast plate
holes, bend as required, you will be glad when you are up on the tower!
Mount the assembled plate to your temporary mast, as shown in Picture 3, at a convenient
height for assembly purposes using the four 2” u-bolts. Pay attention to the orientation when
mounting it, as the plate is not symmetrical.
• Locate: 4 - 2” aluminum saddles
4 - #6-32x1” machine screws
4 - #6-32 Nylok nuts
Mount the saddles as shown in Picture 2. Be aware that the mast saddles mount on the
opposite side from the boom.

SteppIR Antennas — MonstIR 15
Boom Assembly
The boom was completely assembled and drilled and marked at the factory to assure
precision element alignment. You may notice in some cases that on a given splice ( Picture
4 .5) the holes on each side of the splice are at 90 degrees with each other. This is as de-
signed and not a mistake. The pre-drilled holes are quite snug and align almost perfectly.
The holes are purposely tight so no movement is allowed. Movement will cause work
hardening and that leads to boom failure. Therefore, DO NOT drill out the holes for more
clearance. Thread the bolt in as far as possible, then lightly tap with a hammer to seat the
bolt.
If the holes are visibly out of alignment when you are assembling the boom, you probably
have the boom pieces put together in the wrong order – or the boom sections that do not have
an element bracket on them may need to be rotated 180 degrees. Each boom piece has a
number permanently written, scribed or stamped on it. Match each number with the exact
same number of a corresponding boom piece. Picture 4.5 shows joint # 1 markings inside
the ring (they must line up). Figure 1 shows how each boom section is numbered.
Picture 4.1
Picture 4
Picture 4.5

SteppIR Antennas — MonstIR 16
JOINT NUMBER BOLT SIZE QUANTITY
1 ¼” x 20 x 3.5 “ 6
2 ¼” x 20 x 3.75” 3
3 ¼” x 20 x 3.75 “ 6
4 ¼ “x 20 x 3.75 “ 3
5 ¼” x 20 x 3.5 “ 6
TABLE 1
Figure 1
3/8-16 x 4-1/4 SS Bolts
Zip Ties
Counter-Weight
Bracket (1)
Figure 1.2
3/8-16 x 4-1/4 SS Bolts
Standard Bracket (2)
New Element Bracket Mounting
3/8-16 x 3/4 Type FTC Black Oxide Self Tapping Bolts
We have modified the hardware securing the (3) 40m element mounting brackets to the
boom on your new MonstIR antenna (Figure 1.2) as of August 2007.
Counter-Weight Bracket (1):
• Remove zip ties
• Make sure counter-weights clear the hole
• Position vertical truss supports
• Install the included bolt / no washer
• Put ’Connector Protector’ on the threads
• Tighten the nut securely
Standard Bracket (2):
• Position vertical truss supports
• Install the included bolt / no washer
• Put ’Connector Protector’ on the threads
• Tighten the nut securely

SteppIR Antennas — MonstIR 17
Refer to Table 1 for selecting proper bolt sizes for each respective connection. A socket
wrench is a better choice because the Nylok nuts can’t be hand turned so it’s a lot more labor
intensive without the socket wrench.
1. You will probably find that it is easiest to build the boom on the ground as opposed
to mounting it on the temporarily mounted boom to mast plate. Locate and position
the six sections of boom tubing and the respective fasteners.
It is advisable to spray a small amount of WD40 or apply a thin film of anti-seize
grease (provided) around the circumference of all male boom splice pieces and on 6”
of the 2 1/2” tube that slides into the 2 ¾” tube at joints 2 and 4 before sliding the fe-
male sections over them.
Do NOT twist the aluminum tubing excessively as that can cause binding.
Apply some anti-seize lubricant to the insides of all the nuts prior to assembly. As-
semble the boom by sliding the six sections together in the order shown in Figure 1.
Insert the required bolts into the holes and loosely attach them with the ¼” Nylok
nuts. Note that, in some cases you may find it necessary to assist the bolts that you
are installing by “threading” them in with a wrench. DO NOT attempt to hammer
them into place, you can lightly tap the bolts in after threading them in as far as possi-
ble.
130
69-6 feet
Turning Radius = 39.8 Feet
07/14/06 Revised for 112" 6m passive
DVRReflector Director 1 Director 2
220
90
404
184
417
MAST
28
6M option
DIR 3
112"
6M option
DIR 4
104.5"
103.0
35.00
Figure 2

SteppIR Antennas — MonstIR 18
NOTE: The boom section with the number “1” engraved on it has two 3 lb. counter
weights in the end of it to make the weight center and provide zero mast torque
near the same point on the boom.
2. Orient the vertical bolts so the heads are pointing skyward as shown in Picture 4.8.
This prevents chafing of the boom truss on joints 1 and 5 and if the nuts did ever
come off, gravity would keep the bolts in place.
3. There are also three holes 5/16” in diameter and three 5/16” eye bolts. Two are for
the boom truss and the third is for the EZ-eye feature that is explained in a later sec-
tion. The eye of the bolt goes on the topside of the boom with the Nylok nut on the
bottom side (Picture 4.8).
4. After assembling each of the five joints as shown in Fig 1. Tighten the nuts on each
bolt and eye bolt securely. Before continuing to the next step, verify that all nuts and
bolts, including those installed at the factory, are securely tightened.
Element Bracket Assembly
1. Mount the assembled boom upside down on the mast plate as shown in Picture 5 us-
ing two 2 ¾” u-bolts. Apply anti-seize to the two U-bolts and lightly tighten. The
boom will be rotated into the correct position, after the element plates and element
housings have been installed.
Picture 4.8
Picture 5
Picture 5.5

SteppIR Antennas — MonstIR 19
2. Picture 5.5 shows how the element will look when complete and right side up.
3. Mount the three large element plates oriented as shown in Figure 2 using six ¼” x 20
x 1” flat head bolts. Tighten securely.
NOTE: If the mounting holes for the element plates do not line up with the holes in the
element bracket it may be necessary to loosen the horizontal bolts that hold the ele-
ment bracket to the boom. After mounting the element plates to the element
bracket be sure to re tighten the element bracket bolts.
4. Each element plate has eight machined U-saddles mounted to them. There are two
types of saddles, notice the difference in height of the semi-circle cutout. One is
much lower than the other. Mount the saddles as shown in Picture 6 & 7 on all three
of the large element plates.
There are two saddles used at each of the four position, one must be a “low” one and
one must be a “high” one, never two of the same together. Refer to Picture 6 for
proper assembly. Use eight 3/8” x 16 x 4-1/4” bolts to assemble the saddles and truss
support bracket as shown in Picture 7. Tighten the nuts only enough to keep them
from falling off.
Picture 6
Picture 7

5. When assembling the element housings:
• Before mounting the 40m element housings (Figure 3) make sure each one has two rubber
boots installed as shown in Picture 7.4.
• The 20m housing (Figure 4) rubber boots will be installed with the 18’ telescoping poles
Picture 32.
• Remove any packing material in the back of each element housing.
• Do a visual check to verify nothing looks out of order.
• Using the “A” screws install the gasket and back cover on each housing.
• Mount the three 40m element housings to the element plates making sure they are oriented
correctly as shown in Picture 7.4 using the “B” & “C” screws.
• Mount the 20m element housings (Dir 1) to the small element bracket. (Ref Figure 2)
• Tighten securely.
Note: The Director 1 element plate can be mounted two ways, the correct position puts the
element support tubes closest to the mast plate, see Figure 1 & 2. The #10-32 screws
do not need anti-seize lubricant, they have special lubricated nuts.
SteppIR Antennas — MonstIR 20
C==> 10-32 X 7/8
(60-0061)
A==> 10-32 X 3/4
(60-0017)
B==> 10-32 X 1-1/4
(60-0072)
A
B
A
40m Element Housing Installation
C
A
A
20m Element Housing Installation
Figure 3
Figure 4