I'd look in the service bay like suggested earlier or the roof. Our MS was wired from the entailment area to the roof with two coaxial cables, under a vent cap from the factory. Both cables were labeled and easily identified. They also wired a cable from the entertainment area to the street side panel where our level-up control and battery cut-off switch are located making it easy to connect to campground cable if the desire/need was there.
We just had the Winguard Travler dish mounted on the roof of our RV last month, works GREAT!! :B
Dan