Not sure it you are looking to boost a cell signal while camping or just want to know what the existing antenna is for, but if you are interested in a cell booster system I use the weBoost slim:
Combined with these:
I mount the directional antenna on an extension pole like this:
which I clamp to the front edge of the slide when its extended. There is also an adapter needed to connect the low loss coax cable to the booster, best to call Wilson to get that. You can mount the booster and cable in a storage area, mount the cradle inside the trailer convenient to connect your phone to the TV, and then just pull out the cable, connect it to the antenna, clamp it to the slide, and extend it. Once set up you need to slowly rotate the antenna to maximize signal strength. The whole process takes me about 10 minutes as part of camp setup.
If you have a weak cell signal this system pulls it in well. Most of the time it works great for me, Netflix and HBO streaming no problem. It can't work miracles though, it can't boost a signal that isn't there, so if you're camped in the bottom of a hollow out of line of sight to a cell tower you still won't get anything.