Man, there's nothing worse than going camping and roughing in the wild and not being able to get TV. I just hate that, lol... :R
A forum member posted once about using a tall mast attached to the trailer to get the antenna higher. Not sure how much that helps but I would consider it if it did make a worthwhile difference. Maybe use 2 or 3 8' lengths of aluminum pipe with a Winegard Sensar IV?
We were at a CG on the Oregon coast a few weeks ago and they had digital cable and it was excellent and had lots of channels. For CGs that do offer cable TV, not sure how many have digital cable now. Not many CGs we've been to have cable TV and when they do, it's usually just a handful of sites.