On my last 5er I had a Traveler 1000 unit. It would find the 3 satellites for HD without even having a dish receiver attached or turned on. Worked great! Works just like home unit. Make sure you stow it before moving.
Only issue was when your site was surrounded by trees. Then the blu ray movies came out.
With a tripod you can move the antenna if needed.
On our new unit the DX3, the antenna only captures 1 satellite at a time. So switching channels may cause the antenna to have to lock on to other satellite. It is annoying to me but does work.
You would have to have another portable unit in order to get around obstructions.