Actually WINEGARD also makes a WALL PLATE ASSY that has the RF Amplifier "BOOSTER" located in the wall plate assy for 'non amplified' type Rv Antennas....
This is the WINEGARD RA-7296 Single Amplifier...
"White amplified wall plate with on/off switch and indicator light works with Winegard non-amplified 75 ohm RV antennas. Uses 12V DC. The switch plate has an amplified circuit and 3 ports in the back and one cable port up front as well as the 12VDC (cigarette lighter) outlet. When you push the button (LED is lit) the roof antenna signal is boosted and the TV receives that signal. When you push the button to turn off the LED, it allows the TV to receive the campground cable signal..." This RA-7296 WALL PLATE RF Amplifier is only used with non amplified type Rv Antennas.

RVupgrades.com image
Looks exactly like the WINEGARD RV-7042 WALL PLATE power supply and switcher that most RV Campers have installed to be used with the BATWING type crank up antennas.
I suspect in the early days this was what was being used and got the name 'BOOSTER' which has stuck ever since haha...
Roy Ken