K7MI Tower #4

Tower #4 is a 110 foot 25G tower with a 20' extension
of 2" aluminum tubing. This tower is the main transmit
antenna for 80 and 160. It is a full 1/4 wave vertical on 160
and is used as an end-fed 1/2 wave vertical on 80. The radial field
consists of 60 radials, each 125'  in length. That's about 1.5 miles
of #14 wire.

This is the base of the vertical with a temporary feed system
for testing. Insulators are solid 1.5" fiberglass rod
machined by my friend N7KPK in Utah. to fit inside
the tower legs. Stainless 28mm washers are used for bushings.
 
 
This is the dual-band feed system. The antenna can be tuned remotely
to cover the entire 80 and 160 bands.