I installed a Winegard Playmaker dish on mine and found the two cables under the marked cover after drilling through the fiberglass roof. Be carefull when you drill the hole to not cut the cables. Mine were not long enough and I had to add to them. One was gray and one kind of an orange. Mine NEVER did work correctly as the playmaker gets power from the coax and the cable from the front unit has a hidden splitter "box" in the ceiling that blocks the power from getting to the dish. Newmar did not know where the box is, but acknowledged its presence. Even when I rigged the system for power it never did work very well. It is all coming out and getting a proper trip to the recycling center.
Scot & Donna
2018 Newmar Ventana 3407 (Freightliner) All Electric
Towed: 2003 Jeep Wrangler Sahara