Most private RV parks will have cable TV available of varying degrees. And if you are near a larger city there will generally be over the air TV available. But if you prefer federal/state/city/COE parks you will not get cable and may not get air channels.
We have Dish at home and in the RV. We frequently stay in areas where satellite is the only TV available. But if staying only a day or two where park cable or OTA is available I do not bother to set the satellite dish up.