The antenna booster is actually in the antenna up on the roof. What you are referring to is the power switch for it.
My wall plate unit has a 12VDC cigarette plug on it and a BLACK small push button switch which turns on a GREEN lamp I think... Mine is a RV-7042 model that looks something like this....
photo from google images
On my wall plate is also a standard F-connector and my HDTV has to be connected to this connector in order to use the OTA antenna. Also the GREEN light has to be "ON"...
I think other setups may be different...