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This is a T-Mobile cell site on a low rooftop at 750 El Pomar Rd.
It's hard to see from the street because of the trees, but look carefully at this Google Street View
On the sidewalk across the street the signal was -50 dBm, 30.0 SINR which was the best signal I've gotten anywhere.
Speed test 2023-12-22 with Galaxy S22 was almost 1Gbps download