Which automatic sat dish for Dish Network service?

The current state of the art portable dome for Dish is the Winegard Pathway X2. The capability of using either the three western arc or three eastern arc satellites adds more flexibility to your aiming options, but unfortunately, there is no permanent roof mount option for that model. For roof top mounts, as said previously, the RoadTrip Mission would be a good alternative, and it's available in either both stationary and in-motion models. It does have the typical dome limitations of course, also as previously mentioned.

I have the TailGater for the Dish System and it works Great for me

DirecTV requires the Winegard Traveler type dish to get HD. Since you have Dish service, you can get Dish HD with a small 'dome' type antenna like the Winegard Roadtrip mission. It's a few to several hundred dollars cheaper than the Travler, and smaller and 'neater' also. Then again, it's a single feed horn type that automatically re-aims itself if you turn to a channel on a different satellite.... which means you can essentially only watch one TV program at a time. The Traveler would allow you to watch two or more TVs at the same time. If you don't want a permanent dish on your roof, one of those newer portable units would be sufficient. Personally, I like that I don't have to hook up coax, set a dish unit out on the ground, etc. to set up the TV system. I have a Roadtrip Mission and like it.

Continue to be really happy with the Trav'ler