I'm not an expert on this but here's how it works on mine. The wall plate with one coax connection is the antenna connection. Run a coax cable from that plate to your TV. I use Direct TV so the following is how I use the second wall plate: the second wall plate has two coax connections so I run a coax cable from the bottom connection to my Direct TV receiver. Now, run a audio video cable (red, white, yellow) from the receiver to the audio video on the back of your TV. Now, use your TV menu to change "input" from TV to AV. As long as your TV is set to "AIR", you can switch back and forth from antenna viewing to satellite viewing. If you have a second TV, put a splitter on that bottom coax and split it to go to your receiver and then up to that top coax on the wall plate that has two connections. I've never used cable but I think it's the same. This might sound a little complicated but if you play with it a little you'll figure it out. Good Luck.
Andy & Carole
2014 Winnebago Itasca Navion iQ 24V
2015 Ford C-Max toad / Blue Ox Alpha / RVi Brake