Our 5 er is pre-wired for a Satelite dish, the roof is marked where to drill a hole to access the cable. My question is what's normally used to cover the hole once the cable is fished through the op...
I think I would use a marine cable deck seal such as this one to bring the cable through the roof. My son had one on the cabin of his sailboat for years and it never let a drop of water inside. See no reason it would not work great for RV use. Barney