We have one and it’s really nice. Like others mentioned it does two things:
1. You can purchase data (ours is through ATT) and have internet everywhere you go, even while driving
2. When you arrive at a campground (or home) you can connect it he winegard to that WiFi
The benefit is that for all the WiFi devices in your RV (phones, Alexa, tv, Roku, tablets, laptops, etc) you never have to change Their WiFi networks. They are always connected to your Winegard and only the winegard has to connect to the local router WiFi