Wiring for Winegard SK-3005 - Newmar X-Aire

I have a 2008 Newmar X-Aire toy hauler. I just ordered a Wingard SK-3005. Has anyone installed one of these on their X-Aire? Newmar is not very informative on how their wired their unit on TV/Sat. I am going to remove the factory box cover in the roof where it is pre-wired for sat. From the inside, I only see a a power wire that is installed from bedroom to the roof. Not for sure if cable is installed or not.. Looking for some information since Newmar does not provide a schematic or atleast I can't find one..