[jimcol]

I had a similar issue only it was when we turned on the bathroom fan. Replaced the ends on the coax behind the front room television and it solved the issue. Evidently the Amish that build these things are not very good with crimped coax connectors. I think you may be dealing with an electrical interference to the TV signal as opposed to a low voltage issue. Perhaps John Kohl will be along shortly to speak to this issue. He has a ton of knowledge in this area. Jim