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The Radio spectrum, the total range of radio frequencies that can be used for communication in a given area, is a limited resource. Each radio transmission occupies a portion of the total bandwidth available. Radio bandwidth is regarded as an economic good which has a monetary cost and is in increasing demand. In some parts of the radio spectrum, the right to use a frequency band or even a single radio channel is bought and sold for millions of dollars.

Since these frequencies have a shorter range than previous cellphone bands, the cells will be smaller than the cells in previous cellular networks which could be many miles across. Millimeter-wave cells will only be a few blocks long, and instead of a cell base station and antenna tower, they will have many small antennas attached to utility poles and buildings. Terrestrial television, over-the-air television, or broadcast television – the oldest television technology, is the transmission of television signals from land-based television stations to television receivers in viewer's homes.

Other systems are made for use by commercial firms such as taxi and delivery services. VHF systems use channels in the range 30–50 MHz and 150–172 MHz. UHF systems use the 450–470 MHz band and in some areas the 470–512 MHz range. In general, VHF systems have a longer range than UHF but require longer antennas.

A receiver intercepts the radio wave and extracts the information-bearing modulation signal, which is converted back to a human usable form with another transducer such as a loudspeaker. Applications of radio waves that do not involve transmitting the waves significant distances, such as RF heating used in industrial processes and microwave ovens, and medical uses such as diathermy and MRI machines, are not usually called radio. The radio.net database contains more than 6,000 radio stations and web radios from the USA. You can listen to more than 15,300 public and private radio stations via FM & AM. However, there are also AM/FM stations that play oldies or rock music, ignoring the current charts. Find out new ones and discover radio stations by language, radio stations by country, and radio stations by city.

A few stations experimented with telephone lines to allow two or more outlets to carry (or “network”) an occasional presidential address or sporting event. Magazines, books, and even movies featured or included references to radio broadcasting. Radio-controlled models – a popular hobby is playing with radio-controlled model boats, cars, airplanes, and helicopters which are controlled by radio signals from a handheld console with a joystick. Most recent transmitters use the 2.4 GHz ISM band with multiple control channels modulated with PWM, PCM or FSK. Ground-penetrating radar – a specialized radar instrument that is rolled along the ground surface in a cart and transmits a beam of radio waves into the ground, producing an image of subsurface objects. Since radio waves cannot penetrate very far into earth, the depth of GPR is limited to about 50 feet.

The program is then received not via AM/FM or HD Radio, but via the Internet, which is why this reception channel is also called Internet radio or web radio. The selection of radio stations is therefore much greater than with classic radio. The easiest way to listen to the radio on your mobile phone is via a radio app. Most radio apps are free and easily available in the respective app stores for iOS and Android.