When we were in Asheville, NC, this past summer at an RV park high up on a mountain top, they gave us a box and a remote. This was with our old coach and the system did not work with our '08 motorhome. My brother with is new 2014 Tiffin, it worked.
The campground host came by to check things out as he brought a TV and connected it at the post and it worked. He blamed our coach. Since I'm not a techie person, we just used the antenna as we received a few channels (if I remember correctly).
After reading this thread, I now see what the future holds (irritating). I've only connected cable once to the new coach in Las Cruces, NM, at the Hacienda RV Resort and it worked fine there with just connecting to our cable connection in the bay.
I'm really ready to change to an attic antenna at the house and dump cable as we seem to only watch the major networks. Paying for cable is a waste if you don't use it.
MM.