If you want to use the 2nd tuner on your HR22 while on the road, you can buy a SWM3 antenna and set it up on a tripod. You would only need to run one cable from the antenna to the receiver and no B-Band converter would be required.
There are many other options including automatic or semi-automatic ground mounted antennas but you cannot receive the DirecTV HDTV programming and you would need to run 2 cables plus add the B-Band converters (two) for full operation.
There are also roof mounted automatic domes style antennas (same rules as the portables) or the "King of the Road" is the Winegard Trav'ler which is a fully automatic roof mounted SWM3 antenna which allows you do anything you want!