Winegard Sensar III wall plate

The cable inlet goes to the cable port on plate.
The antenna goes to the antenna port.
The output of the plate goes to the TV.
Which make and model of wall plate do you have?

There are electronics and 3 coax input\outputs (1 in from antenna, one in from cable jack and one out to TV) on the back of the wall plate.

The little push button on the front makes the decision. Button in, green light on, Antenna. button out, red light off, cable input. Go to Winegard website, winegard.com. and look for instructions and pictures.

edted to change red to green...

Here are the instructions, and pictures. Please read both pages....

How to install and operate TV antenna/cable switch.

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

Like I said, READ THE Instructions I sent. All your answers are there!

Hear is another set of instructions, covers several different versions of the switches. They all work the same, though.

The output on the antenna power plate goes to an input to the video switch, the cable to the campground connection goes to another input in the video switch.
The output from the vifeo switch goes to each of the TVs and possible to a dvd/vcr.
The led indicates that there is power going to the booster located in the antenna head.
video switch

Thanks, Johno02, got it!

These things are so simple that all the dealers and salespeople never explain how it works, or how to use it. Then too, most of them don't know either. Now you know ow simple it actually is. But remember, some builders go out of the way to make complicated and fancy. I had an occasion where all the TVs worked on cable or satellite, but none worked on antenna. Took a while for me to realize that all the TV were older analog sets, and all the OTA broadcasts are digital!!