All the TT's and MH's I've owned the 12 volt outlet and switch to amplify the antenna was in the overhead cabinet.
The switch is very small, and very hard to see inside the dark cabinet. When you switch it on. THEN a red light appears next to it. All RV antenna's are amplified you just have to turn it on.
I put one of the touch lights in that cabinet so I CAN see the darn switch to turn it on! :B