I think a better option is to mount a trap at the top and run a single horizontal wire for the 160 portion. This way you wouldn't be concerned about the 80 meter vertical coupling into the 160 antenna, and the complexity of switching your feedline between two antennas. I know of two hams who have done that successfully, although I have not tried it myself.
Rick K2XT _________________ Topband Reflector Archives - http://www.contesting.com/_topband
