All of the Unifi stuff is WiFi, not cellular, but you already knew that, right? If your iPhone can't get a cellular signal on your tractor, it would use WiFi if it was available. You can even make phone calls over WiFi with the iPhone if you enable that feature. But the way I see it, in order to work, the mesh AP would still need a decent WiFi signal from somewhere else on the mesh network. And if that WiFi signal is strong enough for the AP, it's probably strong enough for the iPhone. Unless the larger antenna on the AP lets it work on a weaker WiFi signal. Then the AP would boost the WiFi signal enough for your iPhone to connect. You haven't wasted much if it doesn't work, and there's always nanoBeams to extend the network out to specific locations, like Paul was mentioning with his some day rifle range. Your experiment is interesting though, because if it works, the tractor would be a roving AP you could put in a variety of places. "Hey hon, lets take the tractor on the picnic this afternoon so I can listen to the game."

:laughing:
That's one thing I wish there was a way of measuring: WiFi signal strength, in dB. There was a hack on the earlier versions of iOS that would let the phones display signal strength in dB, but Apple in their infinite wisdom broke it. Or maybe that was cellular signal strength? I'd like to measure that, too, as it would help in pointing the Yagi antenna on the cell phone signal booster. Maybe there's an app for that? I'll have go digging around some more.