I don't know much antenna theory, ask me something regarding human biology & I might be a better authority.
However, back when I lived in IL in the early 90's, I used to have a tower and not enough space to put a good radial field down. What I did to get on 160 was make a shortened delta loop with the apex at the top of the tower and center fed at the base, held off the tower by around 7-12". I had a relatively small, and inexpensive vacuum variable at the feedpoint at the bottom and ran a wire up the tower held off by spacers from that feedpoint till the capacitance was sufficient that at the least capacitance from the VV, I was 1:1 at 1.800. I had a servo attached to the VV and enclosed everything in a plastic mailbox and mounted that at the tower. I had the matching servo in the shack and was able to adjust that small VV to give me 1:1 across the entire 160 meter band. I believe the VV was a 5KV 300pf variety. This may not be what you need to do with your setup but it allowed me to use a cheap VV and surplus servos to give me a perfect feedpoint match and I had no issues with my old 77SX with this setup. And when running QRP I had fantastic results. Wish my current Inv-L with 60 130' radials worked nearly as well. Gary KA1J _________________ Topband Reflector
