No special training or expensive tools or parts are required. One way channel. Direction of the future. For example, running wires between buildings is probably not legal if the buildings are separated by a public street. Sender and receiver use some sort of dish antenna.
Weather interferes with signals.
For instance, clouds, rain, lightning, etc. may adversely affect communication. Radio transmissions easy to tap. A big concern for companies worried about competitors stealing plans. This is important because if the satellite moves, the ground antenna must follow its movements. Satellite typically acts as a repeater , receiving signals from earth on one channel and rebroadcasting them on another.