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TG,
My opinion is based on the report of only a single channel suffering a problem. If IMD was occurring inside the amplifier, it would be unlikely for it to affect only one channel except by extraordinary coincidence. That said, I've learned the hard way to not rule anything out...
Mr Pants,
No, the DB4 would not be a reliable choice as it would likely cost you WFAA unless you added a dipole for high-VHF. Out of the box, the 7-69 antenna (or a comparable model) suggested by JC would be be logical. The Yagi UHF section of that style antenna is quite good at reducing reflections from the side and rear and would be expected to resolve multi-path issues.
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