CHAPTER
Assembly of the Boom-to-Mast
Brackets and Boom
Select the boom-to-bracket clamp parts (Item Nos.
89 & 90). Loosely assemble them on the boom
ends (Item No. 79), as shown in Figure 1. Line up
the holes on both brackets and both boom ends.
Secure the two brackets together with four (4)
1/4"-20 x 3/4" bolts, lockwashers and nuts (Item
Nos. 34, 39 & 38). Secure the brackets to the two
boom ends using the 5/16"-18 x 2 3/4" bolts,
lockwashers and nuts (Item Nos. 28, 31 & 29).
Tighten these six bolts securely.
Assemble the two cast aluminum brackets (Item
No. 82) on the mast at the desired height above
your tower. Secure the two brackets together using
the two (2) 5/16"-18 x 3 " bolts, lockwashers and
nuts (Item Nos. 27,31 & 29). You may wish to drill
a 5/16" hole through the cast brackets' center hole
and through the mast and secure using a 5/16"-18 x
3 3/4" bolt, lockwasher, and nut (Item Nos. 30, 31
& 29). This bolt will prevent the antenna from
twisting on the mast in high winds. See Figure 1.
The four (4) 5 inch bolts will be installed when the
antenna is installed on the mast.
NOTE: The use of heavy motor oil on stainless
steel threads will prevent galling of threads.
Slip the two remaining boom sections (Item No.
88) over the two swaged ends of the assembled
boom and secure using a 1/4"-20 x 2 1/2" bolt,
lockwasher and nut (Item Nos. 35, 39 & 38), as
shown in Figure 2.
Ite
m
No.
26
27
28
29
30
31
Item
Description
No.
Description
Bolt, hex head, 5/16"-18 x 5"
38
Nut, hex, 1/4"--20
Bolt, hex head, 5/16"-18 x 3"
39
Lockwasher, internal,
Bolt, hex head, 5/16"-18 x 2 3/4"
79
Tube, Boom, 2" x 79 1/2"
Nut, hex, 5/16"-18
82
Mast Bracket, cast
Bolt, hex head, 5/16"-18 x 3 3/4"
89
Clamp, Boom-to-Bracket
Lockwasher, split, 5/16"
90
Bracket, Casting-to-
Bolt, hex head, 1/4"-20 x 3/4"
Figure 1 Boom-to-Mast
Bracket
