I know this sounds simple but lets cover all the bases as I am a guy and can understand the need for cable TV when its available, lol. Green light off (antenna booster) and switch to Cable, not air or antenna, in TV screen menu. Hope its something this simple and ya get it working. Hevent had a chance to use mine yet as my trailer is still fairly new and I havent had the chance to get to a park with cable. But thats how it works at home. May not have to change the TV menu at all but if turning off antenna booster (green light) dosent work, try TV menu. Thats what my Dealer told me.
2013 Coachmen Freedom Express 291 QBS
2013 Chevy Silverado 1500 Crew 4x4 5.3