I found I had to put a relay in the feedline to my inverted L to completely open the line on rx. Your typical "coax relay" only opens the center conductor. Fortunately on 160 m. an open frame relay that opens the entire line isn't much of an impedance bump. It is essential that the relay be between the antenna and the shack ground system, matching network etc. The inverted L must be isolated from the shack and rx loop antenna system on receive.
73 Rob K5UJ _________________ Topband Reflector Archives - http://www.contesting.com/_topband
