Thanks for the link! I've looked briefly at LTE internet service but hadn't seriously considered it because I'm just on the edge of decent cell service. While my phone usually displays 1-2 bars, it's not even enough to make voice calls. I think due to the topography in the area, my phone can receive signal from the tower but isn't powerful enough to transmit back. It looks like UbiFi also sells 4G signal boosters and external antennas, and that might just do the trick.
I picked up a signal booster, but ended up not needing it- I typically get 2-3 bars, but found a spot in the house where I get 4, and that's good enough for decent speeds that I never got around to setting it up.
Keep in mind that the signal booster isn't magic- it's just a relay with a bigger antenna than what your cell phone has. If you're brave enough, pop up onto your roof with your cell phone- if you get at least three bars up there, I'm guessing that the signal booster could do the trick.
I wish that AT&T or Verizon would offer these unlimited style data plans directly. It seems strange to me that something like UbiFi can contract out off of AT&T's network and offer a flat rate plan, but somehow, phone tethering and data-only devices like verizon's jetpack are always limited to 20gb and slow speeds.
If you really want to make it work you can get a router with an external antenna connector and mount a yagi and point it towards the tower. Might take some trial and error but this is definitely a solvable problem w/ LTE