Two thing REQUIRED..
1. If your trailer doesn't have KeyTV you will need to select "cable tv" on the antenna plate inside the camper. You didn't share the year or model of your trailer so can't get more specific.
2. The TV must have a cable tuner. I don't know of any TV built in the last 20 years that's not "cable ready". You didn't share any info on the TV either but most require you get into the setup menu and change the input from Antenna to Cable then scan for new channels.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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