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Just had a chance to look at the video - something in a power supply somewhere is oscillating on your channel frequency. probably radiated, but might also be carried on the power line.
1) can you see it in the "snow" when your transmitter is off?
2) if you have a small portable TV with rabbit ears and can see it on that, go snooping around your house for where it is strongest.
3) you said you tried turning things off - how about light dimmers, compact fluorescent lamps, anything on the AC line with a clock display that runs even though the main function is off (like a microwave oven?).
Edit: how about your furnace?
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