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At this point, I'd be investigating the following:
1. Follow up with WG re: the antenna balun and phasing harness.
2. Swap coax
3. Investigate electrical or electronic noise.
The last one is best done with a spectrum analyzer, usually not something you'll find except in the hands of a serious hobbyist or someone who need one for their daily work. Do you know any cable techs? They usually use one that also works for OTA systems.
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