Currently, In Motion HD for DirecTV is available from IntellianTech (intelliantech.com). It was designed for ships and is VERY pricey as it requires 2 dishes in 28.3" tall radomes. That makes it really tall for a Newell. DirecTV uses 3 satellites (5 if you want local channels and live in certain parts of the U.S.). That makes it very difficult for HD on an in-motion. The Winegard above is a great HD antenna for DirecTV for stationary use.
I found one place online that sells the Intellian Tech K6/I6 Dual for $15,744.75.
http://www.amatteroffax.com/itempage...d-i6-dual.html