Direct TV if we are in one location for a few days. Otherwise, whatever cable service the CG provides (most are free or a couple of $$ at most).
For the Direct TV, we use a tripod, about 4-5 ft high, and an Accu Dish type leveling device. (
www.Accu-dish.com). We "anchor" the tripod with a 2gal water pail (full of water,obviously), and, if in a high wind area, stake it down as well.
We carry two lengths of cable, and can connect them, if necesary for a really long cable length. The tripod is carried up front, in the compartment under the overhang. The actual dish, cables and leveling device are carried in the rear compartment. Takes a bit of maneuvering, but you can get the antenna into the compartment OK.
Gotta have...a "satellite finder" Radio shack for about $30-$40. Also, there are "quick disconnects" (Radio Shack..$3 or $4 for two) available which make the cable installation and tear down a LOT easier, especially when hooking it to the Monty's connector.
Direct TV has a special catagory for RVers. Got to do some paperwork for it. You can get both East and West Coast feeds of the major channels (which we do) for around $8/month. Real handy for watching programs if there is a time conflict on two major channels. Also, recently subscribed to the local area service here. We found that we can move that feature around as we move around...sort of a luxury, but nice to have. Just takes a phone call to change it. Replaces the Monty rooftop antenna use and the minor inconvenience to switch to it for local news or weather.
Lots of info available via a Forum Search...give it a try..