That video gives a good high level explanation of beam forming.
It doesn't bother to delve into the significant signal loss that is incurred by bouncing the signals off of the buildings/obstructions. You can see real world examples of this driving west on 70. The "blank" billboards above Idaho Springs are just microwave reflectors. If you take some time and look at it though, the links are short (back to a peak on the far side of the canyon), because of the signal loss that happens when you bounce a wireless signal.
This is yet another reason that 5G will be much higher power than most people think.




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