How do I set up portable (outside the RV) HD Satellite TV?

[mrpettit]

I'd consider getting a satellite unit for my 2012 20' Flying Cloud if I could set it up fairly easily and use it at home as well.

I don't understand how even if I have a portable unit something like this:
http://www.amazon.com/Satellite-Oasi.../dp/B005110PXA

How I hook it up to the TV inside the AS and get HD?. The only external hookup I think I have is an coaxial cable for traditional cable TV. Is there some sort of external HDMI hookup I can use with a DirecTV receiver?

I'm just curious how it gets hooked up without leaving the door open.