If your TV has a built in tuner it will have antenna jack to connect an antenna.
When you park your camper you will need to aim your antenna, select over the air, and run a channels scan. Digital TV tuners will only go to channels already scanned into memory. Not all channels found will be watchable.
Each location will be different so you have to do this each time you move. If there are other campers their antennas will give you an idea which direction works best.
Hope you didn't pay someone for tech support.