Our setup is similar to witchywoman's. We are using a stationary (only for use when sitting still) automatic (it finds the signal on its own--no aiming necessary) portable (not permanently mounted) antenna with a window mount. ($450.00) We have an HD Dish account for the house, and we added the receiver ($110.00) for the truck at $10 extra per month. Because the antenna is portable it must be stored when not in use. When it is in use, we use a cable lock to secure it to the truck.
We don't always feel like taking the time to set up the antenna if we're only going to be someplace overnight. (It only takes about 6 minutes, including climbing in the box to retrieve it, but sometimes we've just too tired, or it's pouring rain, or we have a super-early pick-up, etc.) In that case we try to find stations using our digital antenna, which is a dipole (long wire with center connection point) attached to the windshield. We find stations more often than we thought we would. Part of the trick of being successful with the dipole, we've found, is to park with the front of the truck aimed in the general direction of the nearest large town/city, preferably with no other trucks in front of us.
Our receiver is not a recorder. We have a fairly extensive BluRay library with us in the truck for those time when there's no reception, we don't feel like setting up the dish, or we're rolling. If you have unlimited internet in the truck, you could use a NetFlix or similar account to watch movies or shows.
The only other thing I'll mention is that we had to add a sound system to our tv to get good sound effects, especially for movies. We used a 5 speaker system designed for computers ($70.00).
