I don't think people realize how individual the situation is for rural internet.
LTE carriers use more than one frequency. 800mhz, 950mhz, 1750mhz, etc...what tower you have near you, it's height, who leases that tower and gets the good spot on the right side of the water tower, the frequency it is using, the obstacles, terrain, etc. all impact what you are going to get.
if you look up your area for towers on cellmapper, you can see who is where, how far they are, the elevation it is, lookup the license on FCC, see who is using what.
doing your research, tuning and aiming the antenna at the proper tower will go a long way toward improving service. not every device is going to equally receive all the same frequencys, you gotta find a provider that uses a tower you can hit at a frequency your device can use, and learn radio theory and antenna design if you want to improve on what the masses are given.