I have a 2015 27'FB Serenity with Directv. I ordered it through Airstream of Spokane.
Nick, the owner, hired an outside installation specialist to install a Winegard HD Travler antenna to install the antenna on the roof. I love the system, although it is a little pricey. Total installation + dish was $2500.00.
The Travler antenna automatically unfolds itself and locates the satellites when powered on. My Directv receiver is mounted in the same overhead storage area as the Blu-ray player. The installer included a nice remote control HDMI switch so that you can switch between Blu-ray player, Satellite TV, Front or Rear TV.
We love the setup. Since we were already a DirecTV subscriber, we just wanted to use one of our spare receivers. Directv is the only satellite system that supports full 1080p HD TV and 3D TV. It is also the only company that has NFL Sunday ticket for watching all the NFL games.