Our rear antenna signal is identical to the front antenna signal, whether analog or digital ...so is the outside TV which mirrors the rear TV. I suspect if you follow skigramp's suggestion, you are likely to find a problem in the cabling somewhere between the switch box and the rear TV. It is possible to have a bad connection somewhere, or to have a damaged cable (screw or staple through it, etc).
Whenever a dealer tells me "oh, they're all that way," I know what they really mean is "we'd rather ignore your problem than try to resolve it."
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Paul (KE5LXU) ...was fulltimin', now parttimin'
2022 Coachmen Leprechaun 319MB
towing 2017 Jeep Grand Cherokee Limited
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