There are more methods of data communication by radio than we could discuss in a semester. In general . Bandwidth in radio is determined by the width of the channel. The upper frequency of the channel minus the lower frequency gives the bandwidth. 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.