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Assuming omnidirectional antennas.

If you aim well enough, that finite spectrum is only shared by a handful of clients.

You could go even further and construct some kind of copper tube to send your radio signals down.

Yes, having a lot of antennas on the base station is just like attaching a mile-long cable to your cell phone.

Why run a copper tube kilometers when a point to point microwave will be way cheaper?

Rain