You can get a portable dish and set it up outside. They can be had for near about nothing. I take one wherever I go and have been for years. If you are talking about an automatic rooftop unit, yes, expensive.
2010 Jayco Quest G2(SOLD)
2014 Jayco Eagle 33.5RETS
2007 Ram 2500 5.9L Cummins(SOLD)
2015 Ram 2500 6.7L Cummins 4WD