I need to set up a network outdoors. I'm looking for routers that can accept wifi (often public) input on the WAN side for internet, and then route that traffic to wifi clients of its own. I.e., the box has to act as a router, not a bridge or AP per se. It also has to have an external antenna, or at least a connection for one. Long range is what we're shooting for. I've seen some boxes by Engenius, TP-Link, Alfa that do this. Any recommendations?