The first time I had cable at a campground I did not have any
cable with me to hook it up so did not get to use it.
We just got back from our first extended trip (we have had the
RV for almost 2 years) and had two places that had cable available
and it was good to have it hooked up.
Our RV has a cable input in the bay where the water,
electricity, etc hook up. So on the post at the campground
where the shore power comes in I hooked a cable (like you would use
at home) from the post to my cable input in the RV, it needed to be
about 6 feet.
I then had to program both TV's to get the signal each time,
through the menu of the TV (pick cable as the input and do the auto
program channel option) and voila we had TV like at home which made
my wife very happy. I just watch movies on the road.