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Coaxial connection seems to have switched polarity (on antenna/broadcast television)?

I get a great TV signal by touching the center wire of a coaxial cable to the threads of the wall connection. If I screw on the cable properly, there is no signal. What's happening and how do I ...
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Can I move a UHF masthead amp power supply to a different socket in my house?

I have two TV wall plate sockets in my house. One has a 12V power supply for a masthead amp plugged in to it. If I switch that off, both sockets stop working. I measured the second socket with my ...