Seems like everyone likes to call this ANTENNA WALL PLATE PANEL "THE BOOSTER".

Althought WINEGUARD does indeed have a ANTENNA WALL PLATE with an actual RF PRE_AMPLIFIER (BOOSER) incuded on the panel all the ones I have ever seen installed in the RV's just includes a small controller ckt board, a three port transformer, a 12VDC cig lighter plug, a push button, a small LED light, and a "F" connector for the main TV. The PUSH BUTTON sends 12VDC up the ROOF MOUNTED RG Cable to operated the RF-PREAMPLIFIER (BOOSTER AMP) which is located inside the BATWING Antenna.
This is a typical ANTENNA WALL PLATE showing rear connections.
This is a typical wiring configurations showing the TV CABLE ROUTING.

As stated in the other comments here the PUSH BUTTON should be "OFF" (LED light out" when using the CABLE TV port connections.
Just for clarification
Roy Ken