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.

Best of luck!