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T-Mobile is the only carrier on a monopole at a CenturyLink office at Industry Road and Marksheffel. It was first seen on CellMapper February 2023, and it may have been a Sprint conversion. Despite the tower's location at an ISP, the speeds indicate the backhaul is limited to 1 Gbps.
Speed test on 2023-09-10 at close range on a Galaxy S22+ running on Google Fi, NR NSA: 648.09/139.32 Mbps, 18 ms (results)