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T-Mobile at the Western Museum of Mining & Industry (Google Maps)
This was a Sprint cell site converted to T-Mobile on/around July 2023.
Best signal on NR was -68 dBm on 8/9/23 at 39.02276796,-104.83116096.
See also Sprint (last seen June 22 2023) and AT&T at this site. This is an old photo with Sprint