GroundUrMast: Thanks for all your input but I've replaced every part of the system but the mast. I can't imagine what could be corroded and I've used multiple coax runs, transformers and tuners. I don't know how to check for interference from anything nearby (as I noted in my OP I'm near an air force base so maybe they are doing something) and frankly, I've lost faith in the TVFR. My neighbors report the same situation with their reception and they have a Winegard fringe antenna. As I said, I'm stumped so I'm going to try the amplifier route. After that I'm may look to a deep fringe antenna and then cable. I'll keep you posted!
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