Look again, closely. There is a round sticker on the roof. It's in the middle of the coach side to side and a foot or more back from the edge of the front cap. When you have a SAT dish installed, that's where you open the roof and pickup the other end of those cables. Since your RV is 5 years old it has probably faded quite a bit. But you may still be able to see it.
I looked for a photo but couldn't find one.
Here's a post from an old thread where the poster talked about finding it:
https://www.winnieowners.com/forums/...ml#post3835138