It is hard to give you an accurate estimate.
You can check out
http://opensignal.com/. They compare all of the cell phone providers for a area, and rank them based on their connectivity. Enter in 901 N Broadway, St. Louis, MO 63101, and it seems that T-Mobile is the best provider, with AT&T and Verison leading up the pack.
From briefly looking, it seems with both providers you will get 4G. Congrats on making it to Championship, and Good Luck!
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Alex Webber | Co-Programming Lead and Scouting Lead
Jaguar Robotics FRC 1810
2015 | Greater Kansas City Regional 16/54
2016 | Greater Kansas City Imagery Award
2016 | Iowa Regional