I couldn't resist the temptation to contribute my pile of useless information. But since I use a cell booster all summer, I just had to say something.
I work as a Fire Lookout and the Forest Service provides me with a Wilson booster. At almost 8,000ft. one would think it would work without any problems. Of course you do need some power source, and when ground lightening sucks the batteries dry in your solar power
system, you will only have enough juice to text from 12:30-1:00
This last summer they gave me a non-directional antennae, because the "providers" kept moving thier antennae and changing outputs. It came with a beefy 100ft. cable and the encouragement to put it as high as possible. So, since I climb an 85ft. tower for work, I put it as high as possible...no signal. After a week of moving this and adjusting that, I swapped out the monster cable for the 20ft. smaller gage and whalla as they say.
Not enough signal reaches my remote location to do much that requires data, but I can at least have a phone. Unless there is only one mile visibility due to smoke, or bad weather, or Count Zorg decrees "Thou shalt not have cell today".
I have concluded it is part equipment, part magic. Good luck.