If you have cable or satellite hooked to the television, you may need a ground lift or something similar to a Mondial Magic inline with the coax. I was told I didn't need that for satellite but turns out I did, and it worked. I would believe the cable/satellite/television is the culprit before doubting the Sim P5. Your local HT dealer should have some sort of an in-line ground lift in the $10-20 range - a good place to start. Good luck.
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