Yep, signal booster for when you are using the roof top antenna for TV reception.
Scott and Liz - Southern NM
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I was referring to the tv wall plate for the antenna.
It houses a power supply for the roof top antenna. The 12v DC is inserted into the coax that goes to the antenna when you push the button/switch.
A lot of folks believe the 'booster' or amplifier is in the wall plate. It is located in the antenna.
I know what you are referring to and I was commenting on the fact that the antenna booster plate is not a power supply; just a switch to route 12Vdc to the antenna (yes the amplifier within). It does have a circuit that will detect a ground fault in the coax between the switch and antenna to shut the power off till the short is removed.