amplifier switch

I have a 2004 southwind 32VS, same as yours and there is a wineguard distribution box right near the front TV where you can select front and or rear and select ANT, DVD, VCR, SAT, CABLE and when you select ANT, it turns on the 12V power from the box that goes to the Antenna amplifier. there is no switch, just push ANT button. If you look at the rear of the box you will see the 2 12V wires connected to the box, I will try to find a link to what the box looks like.

Wine guard distribution box