I'd also put RF chokes in series with the DC relay lines, at the base of the vertical antenna to further keep RF off it but also to break it up so the relay line doesn't detune the 80 m. vertical, perhaps with another pair at the shack entrance. All this sure seems like a lot of work which is why I simply hung a wire for 160 inverted L from a 3 foot standoff at the top of my 80 m. mast and did my dual band that way, using the same ground system for both.
73 Rob K5UJ _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector