Could it simply be plugged in to the wrong coax output? On many of these units, mine included, you have 2 jacks above the tv, one for the antenna and one for when you are hooked to cable.
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2017 Jay Feather 7 22BHM Baja/Andersen WD
2018 F150 4x4 3.5L Ecoboost Max Tow
2015 MB Sprinter 2500 Passenger 2.1L Diesel
2007 Ram 2500 4x4 Cummins 5.9L G56
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