The outlet above the wall near the ceiling is 110v A/C. Yes, the cable is connected to the roof antennae and runs off the booster. The wall has a couple of studs that you can find with a stud finder but watch your screw length. It is a pretty easy job to install a mount. Be sure to consider how you secure the TV while traveling (we use velcro straps).
We like the second TV when we have the grandkids and put them to bed early.
Colorado '15 Winnebago Forza 34T w/MKZ hybrid toad