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i'm new, but will jump in anyways...
the KEY TV senses signals, and will shift to the Cable, if hooked up.
if not, the KEY TV will select your roof top antenna (assuming you have one, my RV dealer did NOT tell me I had one, i just tried one night), and you will get off the air signals,
FWIW: I can't figure out what the difference would be between the SAT TV and CATV plates would be on the KEY TV, unless it amplifies different RF frequencies, but IDK.
if your plate has the blue lite on it, unplug & scan for "off the air" channels.
then, plug any cable TV cable into, and replug for "Cable" channel
hope that helps?
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