Telecommunications companies have paid a heavy price for their share of the radio spectrum. So they have been quick to exploit 'multiple antennas' that can increase transmission rates in urban areas.
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Bertoni, H. Talk is cheap in the city. Nature 409, 291–292 (2001). https://doi.org/10.1038/35053248
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DOI: https://doi.org/10.1038/35053248