Other Thoughts...
Fortunately no F81 connectors in this setup!
I do have a Cellular Amplifier in the house (and an antenna outside) to aid with data and voice communication. I'll try taking that offline to see if it's broadcasting a signal that may be interfering. I don't know why I didn't think of that before.
SDR (software defined radio) usb sticks are pretty cheap; do you thing they would provide a handy way of evaluating signal strength with a laptop? Somehow have "radio" and "TV" in separate locations in my mind...never thought to connect the two!
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