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T-Mobile somewhere near Monument CO
As of 2023-09-05 red dot is at 39.091359,-104.8702216 (2nd and Adams St)
As of 2023-09-06, the best signal was -75 dBm on 8/1/23 at 39.09160824,-104.86802556 (2nd and Beacon Lite Rd, Monument, CO)