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Vertical Base Section
The base section is made up of an insulated mounting channel, a mounting plate with hardware, two
2" x 3/8" U-Bolt assemblies and the base antenna section which is 2" OD thick wall, 36" long with a
hole drilled at bottom end for the feedpoint hardware. Inside the base sections is an 18" length of
1.875" OD tubing that is also drilled at the feedpoint. These two sections must be aligned (feedpoint
holes) so the feedpoint hardware can be installed
Using
Figure 4
, attach the aluminum backing plate to the back of the insulated channel. The base
hardware kit contains four 2" hex head bolts, four flat washers, four aluminum spacers, four split
washers and four nuts. From the inside of the channel, insert a 2" hex head bolt with a flat washer
through each of the middle four holes, through the backing plate. Put on the aluminum spacer, a
split washer and a plain hex nut. Tighten firmly, but not enough to crush the insulated channel.
Figure - 4
Using the 36" base section tube with the 18" section inside (and the feedpoint holes are aligned),
install the 1/4-20 x 1" long feedline bolt through the hole in the base section from the inside, so the
threads stick out.
Put on a 1/4" star washer, 1/4" flat washer, then a 1/4-20 nut. Tighten securely.
Add another 1/4" star washer, 1/4" flat washer and 1/4-20 nut, but do not tighten. The feedline from
the UNUN attaches to this hardware.
Figure 5
shows the completed feedpoint assembly.
Figure 5
