Assuming you are trying to get a TV working in one of your outside bays, you only need the 1 coax cable to make it work. The power to the antenna is provided by a wall switch inside the coach. If your inside TV is working properly, find that wall plate. There will be a small (tiny) button or slide switch and a light. When the light is on you will be able to use your TV to view OTA programming. If the light is off then you will not get OTA but you will be able to use the campground cable connection.
Now, if it works inside but not outside I would guess that you have a loose or disconnected splitter that sends the OTA signal to multiple locations. Start by removing the wall plate. The back is labeled with what each coax does. The TV2 connection should go to a splitter so the signal from the antenna can go to the TV(s).