Channel width and the available frequencies for radio communication are determined by the government. Radio bandwidth is limited, and doled out sparingly. In general, the bandwidth will be far lower than fiber optic cable or Cat five twisted pair, but higher than can be achieved on voice quality lines. The cost of radio is directly dependent on the distance. The further you have to reach, the more expensive the transmitter and the receiver and the bigger the antenna required.
Satellites require huge antennas and expensive and complex ground stations.
In general radio is practical when distances are very small, for example a number of digital assistants communicating around a conference table, or when running cable would be impossible or extremely expensive. There is almost no limit to the distance you can communicate data by radio. The Voyager 1 and 2 satellites are still sending data, and they are out far beyond the orbit of Pluto. In order to communicate data between two computers we must have a common method for encoding the data on the selected physical media. Transmission can be either digital, or analog.