Then get one of these to fill the hole in the wall.
https://www.amazon.com/Winegard-RV-7...ustomerReviews
It is marked for which cable goes where. The 12 Vdc will be sent to the King Jack through the coax. You can tell if you have it connected correctly if the lights come on on the King Jack.
I used to get maybe 4 channels here at home before I upgraded. Now I het about 30 channels.
Sudsy