"When you reach a campsite, do you have to set a dish up and find the correct satellite in the sky each time to receive a signal?"
Yes. My gear isn't as nearly as sophisticated as Mexray's, so it usually takes me about 5-10 minutes armed with a Boy Scout compass (but I'm getting better). Until I got some experience, it took much longer. You just plug in the zip code of your location into the satellite receiver, and it gives you the coordinates. So far, the biggest upgrade for my system is those quick disconnect ends for my cables. It saves me a minute or two.
Until recently, I thought you had to have a very
clear shot of the southwest sky. Well, you do, but it doesn't have to be perfectly clear. While in Myrtle Beach State Park campground this May I took one look at the tree canopy and thought it would be a waste of time to try to set up the dish. Then I looked around and saw several dishes set up. So I tried it and, after repositioning the dish a few times, I got an 88% signal, which was more than adequate. Since then I've been on quite a few campsites with trees and, more often than not, I can get a signal.