I was in the same predicament. I first took the SD box from home and installed it into the coax system in my trailer. Nothing but problems. The portable antenna took time to set up and there were times I never found the 101 satellite; very frustrating.
We now have the wireless Genie system at home and take it with us. Nice thing is the three TV's we have hooked up to it can each watch a different channel. And it's not part of the trailer's coax as the Genies use HDMI. I installed the Travler on the roof and only once haven't been able to lock on to the three satellites for HD viewing. Push a button and the Travler does all the work. Wireless Genie is a great system.