Winegard Sensar III wall plate

Thanks for the replies folks, There's no model # on the plate, it came with the RV & its Sensar III Winegard antenna. It has one cable port on the front, an automotive 12V jack, a small button that when pressed cycles a green LED. Mounted on its backside, there is a circuit board with electronic components, and 3 cable ports, 1 with a black cable on it that comes from the RV cable jack, the other with a white cable that comes from the digital antenna, and nothing on the third one. I think I now understand that the antenna will feed over-the-air signals only when the the green LED is on, and when it's OFF, the cable connection is the source feeding the TV. Not sure what the empty 3rd jack in the back is for, or how you would select it if there was a 3rd source to plug into it. Is it likely that the antenna is an amplified one, with electronics in it? Unfortunately, there's no TV signals where I am, so I cannot test it. I will try feeding the cable jack on the RV with an NTSC TV signal and see what happens with the LED OFF. Thanks again