First let me say this: DO NOT BLAME THE CAMPGREOUND
There are a couple of cable standards for digital signals, they have been around since last century and most all TV's today can decode them.. HOWEVER ENCRYPTION is another thing
Some (many) cable companies have decided people are pirating their signals, so where as they have for years encrypted pay to view channels, they now encrypt everyting, I am not sure this is legal, also not sure it is not legal, (Frankly do not care). and if your park is served by one of those companies. EVERYONE has to have a cable box.
I happen to feel they are cutting their own throats (The cable companies) but, well, that is my opinion.