Yes, there is dedicated coax running from the roof box to the cabinet above the front passenger seat. If you have an A/V switch box in that cabinet, the sat coax should be attached to the Sat-In connection on the back. If you send me a PM with your email info, I'll send the schematic via your email. I think it would answer a lot of your questions even though it is not for the year of your MH.
2003 Dolphin L/X 6320