The short Windom someone mentioned is made by Radio Works.

I have a friend here who ran that shortened antenna for a brief time, 
and went back to his G5RV.

I like the full size 80 meter windom, but, it is sometimes not very 
happy when installed as an inverted Vee.

With that tower already in place, I would look seriously at the single 
wire Alpha Delta sloper. It is about 70 feet long. One end is 
connected to the feed line near the top of the tower, and the other 
end slopes downward to a support that is 8 or 10 feet above the 
ground.

With no large beam atop the tower, you would have to run one or two 
ground wires down the tower, and connect them to ground rods at the 
bottom.

You could help the tuning of the sloper a bit by placing a capacitance 
hat on top of the tower, along with whatever antenna you want for vhf 
and uhf.

Bottom line, the more stuff you have on top of the tower, the better 
either the single wire sloper or the two wire version will work.

The 2 wire version will cover 160, 80, and 40. The one I ran for 
awhile also worked on 30.

I think the single wire version is advertised to work through 20 
meters.

I believe the High Power Antenna company also makes a single wire 
model.

If you want to stay with the G5RV, then do as has already been 
suggested. That is, put as much mast as possible above the top of the 
tower, and use several stand off insulators to hold the twin lead away 
from the metal. . The antenna itself will help to guy it, but you may 
need to add one more guy point, which can be a good quality outdoor 
rope or close line type cable.



Mike Duke, K5XU
American Council of Blind Radio Amateurs