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I'm convinced that you are swamping that preamp with signal: the CW and PBS stations are just too strong in your location. I would start with a better UHF antenna, one that is more directional, like an AntennasDirect XG-91, and replace the AP-8700 with a Winegard HDP-269. Aim the antenna directly at channel at the ABC and FOX transmitters: the others should fall back into place.The additional directionality of the XG-91, plus it's additional gain, should solve your situation.
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