My st8 has a tracvision system, it's a in motion system. It works great, but not cheap! I didn't buy it , was lucky and it came with the truck.
http://www.kvh.com/AutoSatTV/
I think so, I don't"have" to run. I have a bottom rate that it takes to get me to crank the truck, if I don't get it well I'm good saying no and turning the dtv back on.