Since you have a Mountain Aire and are now full timing, your best bet would be to purchase and install a DISH Trav'ler roof antenna (not satellite - as it's up in space). The Trav'ler is fully functional with just about all DISH receivers and is a one button to turn on, search all three satellites, and lock on.
We have the Trav'ler and also two DISH 722 dual receivers that we keep in the house from October to May and then switch out to the motor home May to October.
I do agree with others... go on line to Mydish.com and connect to the live chat feature. You can get quicker and better answers there and also use it to change out your "service address" whenever you move from one place to another.
Unless you plan on camping at parks with lots of trees, the Trav'ler will work just fine for you.
Good luck
Ron