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The electronic ignitor for the propane heater generates a spark which causes interference in the TV.
The shield of the coax cable going to your TV is intended to keep this type of interference down. Maybe the shield connection on one of your coax connectors is not making a good connection. Make sure they are tight also. Also, the spark gap for your igniter may have gotten wider with time. Check that. You want it to be as small a gap as possible and still ignite the burner. Also, if the electronic ignition tries multiple times to light the burner, (tick... tick... tick) instead of just once, that would increase the duration of the interference. Maybe your burner or igniter needs to be checked.
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