Problem with T-Mobile Internet

I’m not sure I can do anything about this but… I am camp hosting in a park (25 miles east of Albany, OR surrounded by some mountains) out of the range of T-Mobile Internet service. I currently use a ZTE Falcon Z-917 mobile hot spot for 2 laptops. I cannot get any bars/signal from the park. I can travel about 3-4 miles closer to civilization and get a 1 or 2 bar signal. According to the map online, the nearest T-Mobile tower is about 40 miles away and I do not have a direct line to it due to the canyon I am in.

Is it possible to get/build something that would actually receive a good signal where I am? I am looking at antennas and the various equipment that I would need (booster, router, antenna, etc.) but do not want to spend the money only to find out it doesn’t work. I’ve read about wi-fi finders but they get mixed reviews and still may not get me an accurate reading of a signal. - Michael

Any suggestions? I don’t want to change carriers because of the good data plan I through Millenicom. I’m willing to spend some money if would really work. Help!