on most of my TV's you can't enter the sub-channels. Ex channel 10 will be 10.1, but channel 10.2 can't be entered and you must use the up and down channel button.
with the new TV OTA (over the air) digital signals every time you move the rv or turn the antenna you should re scan
You can go to OTA channel websites to find where the TV station antennas are and what channels you should be able to receive:
https://www.fcc.gov/media/engineering/dtvmaps
https://www.overtheairdigitaltv.com/...-locator-tool/
https://www.antennaweb.org/
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