Cable companies have changed their service delivery so their digital box is required. Once a campground is "upgraded" it is done. This is so cable can deliver digital signal. OTA signal is 99% digital and requires modern TV or converter box
We use Dish Satellite and have an RV Mobile account. With a phone call I can put it "on hold" with no payments for any period of time I choose and resume with a phone call. When I move out of the foot print of the local channels to a new area a simple phone call or online chat will get them to reset my reception location so I get the current local channels. This takes not more than 5 minutes with the tech support person, unless you get someone who hasn't a clue in which case ask for RV support. The update to your system can take as much as 15 minutes, so plan ahead if you want to watch the kickoff.