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The FM broadcast in the United States starts at 88.0 MHz and ends at 108.0 MHz. The band is divided into 100 channels, each 200 kHz (0.2 MHz) wide. The center frequency is located at 1/2 the bandwidth of the FM Channel, or 100 kHz (0.1 MHz) up from the lower end of the channel.

The listening audience, similar to a TV audience and social media users, are the product being sold to advertisers. This is how radio stations make money; through advertising. Extra income also comes from sponsored content and events (however, this is also a form of a advertising) as well as charging callers.

All the FM radio channels are from 88 MHz to 108 MHz.

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Because each channel is 0.2 MHz wide, the center frequencies of adjacent channels differ by 0.2 MHz. Because the lowest channel is centered on 87.9 MHz, the tenths digit (in MHz) of the center frequency of any FM station in the United States is always an odd number.

Internet radio stations don't need an FCC license, but all stations that play copyrighted music do need to obtain a license from a performance rights organization (PRO) such as BMI, ASCAP, and SESAC. Many PROs offer specific licenses based on the type of station (i.e. internet radio vs.

This is because airplanes communicate with the ground and each other on these frequencies. If a radio station's carrier wave were to interfere with instructions from a control tower to an airplane, lives could be put at risk. The lower end of the FCC scale for radios is 88.1 MHz.

The length of the antenna required to transmit a signal is related to the wavelength. Directly transmitting frequencies in the audio range would have long wavelengths requiring a humongous antenna and lots of amplification.