The Winegard is a WiFi booster. It receives weak WiFi signals and amplifies them for use by your devices. It also can be used with Verizon and ATT SIM cards making it a fully functional 4G modem and WiFi router.
I purchased a sim car from Tmobile and have their unlimited plan for just $50 ... put that into the wine guard and it work like a dream! I have great internet access and awesome speed ... and can stream all I want!