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I figured it was a grounding issue but did not realize you were using an outboard audio mixer until I re-read your signature line. yeah, sounds like the RF feedback was getting into the mixer and grounding it to the radio chassis which in turn was grounded solved the problem. Those mixers are not really meant to take much RF and with the antenna system you described it may well have been subjected to a lot of it. I used to have a similar problem with a random length end-fed wire where the wire came directly into the shack's tuner without any coax cable in the system.