Gonna depend on the construction of the coach. That and the layout of where the antenna is relative to where you need the "plate" with the connections and power supply. One of the techs here might be ablet to tell you.
Our Jayco has the "structural foam" roof. So what they did was run the cable from the base of the Winegard where it comes out of the elevating arm, across the roof to a connector right above the cabinet where the plate goes. I always wondered why they didn't go down the hole provided in the Winegard base. It was to avoid tunneling through the foam, or surface mounting the cable.
Would you have to use the old cable to pull the new, or can you fish new and leave the old in place. Which might have to happen if it was secured in the roof structure.
When I replaced the Winegard with King, I abandoned the connection on top of the roof and covered it in Dicor sealant. Then ran the cable down the hole the antenna rotator shaft goes through, notched the control box on the King Jack antenna. That mounts on the ceiling... from there it was 6" of exposed TV cable across the ceiling to a hole I drilled in a cabinet to get to the plate.
You're thinking like I did: All NEW cabling to go with the new antenna! I now have new from Antenna to Plate and from Plate to Front TV. All the new, and all the existing are RG6. The cable from Plate to Rear TV is original but has always been "indoors." Our TV picture is far better on both sets than it was before. The "Park Cable" cable (electrical bay to Plate) is original too. One end is sheltered and the other always inside. I tried a test on it, and it seemed OK but we don't actually use it so it doesn't much matter.
EDIT!!! When you replace TV cabling, you need to either
1. Buy cables with both end terminals already installed, or
2. Strip and Crimp with the actual, genuine, Stripper and Crimper. If you strip the core with pocket knife, cutting pliers, etc. you can "ring" the center conductor. That is very damaging to signal quality since the signal "rides the surface" of the core!
