I also have a portable SAT dish.
I usually bring in the coax from the dish around the right slide forward near the passengers seat. It will go around the rubber seal of the slide.
I hook it up to my receiver box below the TV in the compartment.
Then output the receiver to the TV using HDMI cable but you can also use a regular short coax.
2012 Georgetown XL - 378TS
35,000 miles & still smiling
2015 -Est. 90 days, 2014 - 113 days, 2013 - 98 days, 2012 - 63 days