We have the antenna described below. Had it on both of our Montys. There are are occasions when we're under or behind something that blocks it but there's generally cable there also. And it works with Direct TV.
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AS2003 AUTOMATIC RV DSS 46cm ANTENNA SYSTEM. AUTOMATICALLY RAISES, LOWERS, ORIENTATES ANTENNA FROM INSIDE THE VEHICLE. $795 MORE INFORMATION
AS2003 at $795 plus $29 flat rate shipping to any lower 48 state
US Patent No. 5532710 Automatic Digital Satellite Dish with GPS
This system is totally automatic! Compatible with Dish 500®, the receiver will toggle between 110° and 119° with Global Positioning System technology (GPS). It automatically searches for the correct satellite while your vehicle is parked. Press Power on the wall-mounted control panel in your vehicle to search for the satellite — no numbers to enter!
System includes 18 inch dish, lift system, LNBF, GPS and interior control panel.
The white lift assembly is strong and lightweight; dish support bracket is cast aluminum with aluminum feed arm; cast aluminum base; two motors — one for lift, the other for rotation; attractive base cover. AS-2003 gives you automatic signal location with the GPS system — easy, accurate and fast!