Something else I wanted to add. With Dish most if not all your channels will come from echostar 110 &119. your HD will come from 129. The reason I mention this is sometimes, due to line of sight obstacles you may find you can't lock on all three satellites. This doesn't mean you can't get TV reception but your programming may be limited. The last trip we took I had a tree in the way, I was able to lock on to 110&119 but could not get 129. We had all our programming we just didn't have any HD at that campground. Also, if you want local channels you'll need to contact Dish to let them know where you are and they will unlock those for you.
With the Dishpointer link I provided you need to know what system you have. Ours is Dish 1000.2 (110W 119W 129W) enter the address your at and it gives you the Elevation, azimuth and skew you need.