Many campgrounds you need to "Rent" a set top box from the park office.
THIS IS NOT THE CAMPGROUND's FAULT
In the oldest days Cable was not encryped. They they came up with the idea of "Premimum" channels and they handled them two ways. Either with filters that blocked them (Did not work well) or they encrypted and sold you a Set Top Box
Then they had so many channels you had to have an STB for every set
THen TV makers started making "Cable ready" so you did not need an STB
SO if you wanted a 2nd or 4th set you just added a splitter an hooked up No added income for the Cable Crooks
SO now some systems have gone all encrypted. That way they can ding you for Each and Every Set.
I got fired once for saying all the cable companies are crooks. Ting is. I can prove it.