I agree with Bill. There are MAJOR legal issues with this. The minute the park owner starts charging money he is in violation of copyright; at least that's how the law works here in Canada. The TV stations must pay royalties to the program producers and most of those royalties are based on private viewing assumptions. When you redistribute those signals around a trailer park it is deemed public viewing (even though in theory you now have many "private" viewers) and the copyright laws change.
I would stay far away from that install if I were you.
kat