For tv via the antenna, if the rv has the original tube type tv you will need a digital box OR replace the old tv sets with new flat screen models.
For satellite, if it is the original dish you probably have a Winegard single lnb dish. I replaced mine in 2005, and the replacement is now obsolete and I am back to using a portable dish. The less expensive opt-in is a portable. Many portables are automatic. What you need depends on what you want to be able to do.