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Listen to Top Radio Stations in Saint Louis, MO for Free Systems that broadcast from satellites can generally be received over an entire country or continent. Older terrestrial radio and television are paid for by commercial advertising or governments. In subscription systems like satellite television and satellite radio the customer pays a monthly fee. In these systems, the radio signal is encrypted and can only be decrypted by the receiver, which is controlled by the company and can be deactivated if there is no current subscription plan. To prevent interference between different users, the emission of radio waves is strictly regulated by national laws, coordinated by an international body, the International Telecommunication Union , which allocates bands in the radio spectrum for different uses. With the information contained in two narrow bands of frequencies called sidebands just above and below the carrier frequency. Initially seen as simply another press-supported community