Used to be a low pass filter you could get to put on your tv...if it is something coming in thru the antenna. I would think it is induced into the older style coax running in the walls where the coax is close to the 120 volt wiring, maybe not. I once run into a situation where my lower vhf channels (six and below) were attacked by something called QRM (man made interference). I checked everything on my property and finally started swinging my antenna and it seemed to be coming from across the road at another residence. Not very friendly neighbors either...but out of desperation, I knocked on their door. The lady of the house came to the door and I asked her how her reception was on her tv. She turned it on and it was fine...but on UHF. I had her turn it down on the effected channels and it was God awful. A few weeks later she developed breast cancer, poor gal...but anyhow to get to the point. They split up and went seperate ways and one day after a storm and their trash blew over onto my property, I gathered it up and took it back over and delivered it to the can. About that time a great big thunder crash boomed and their dog came running out of the house...so I took him back and knocked, no one home...came once a week and fed the dog...oh my, what a bunch of folks. But anyhow with the house empty but for the dog I set my vhf ham radio up here in my house and took the hand held and went to their basement and started flipping breakers till I found the one causing all the QRM. I traced the wires and they went back through a four inch plastic pipe. Now for the good part...I took the side cutters and reached as far as I could and cut them off. The house sold at a sheriff's sale and the new owners are tickled just as it is. The problem....there was a remote controlled skylight controlled with an antenna and a hand held remote. You might use this for your problem and start turning off circuits and try to find out which one is the culprit and make adjustments from there. Sorry for the book...ohfred
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