Transmission depends on product of antenna efficiencies. You can also use a small omnidirectional transmitter antenna with low power and huge receiver antenna with sensitive detector, like small space probe sending data to DSN antenna on the Earth.
But there is severe bandwidth limitations in satellite telecommunication. Even optical frequencies could not handle telecommunications for medium sized city. Satellite telecommunications can never replace cable and optical fiber networks in large scale but it can be used in addition to them in remote areas.SpaceX Discussion Thread
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