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Why can a small iPhone antenna reach cell towers miles away? Because of the asymmetric design of cellular networks. While your phone transmits a low-power 4G or 5G signal, the cell tower uses massive MIMO, beamforming, and uplink aggregation to combine multiple narrowband signals into a single high-bandwidth channel. This video explains the engineering behind cell phone antennas vs cellular tower antennas, how towers manage hundreds of simultaneous connections with signal aggregation in LTE and