Space (i.e. a few neighboring frequencies) available for broadcasting within a particular frequency band.
that part of the sky designated for the sole use of aircraft.
The cavity in a cavity wall containing air for insulation.
The portion of an enclosed area which contains air, especially breathable air.
A specified portion of the atmosphere, especially that under the technical aviation control and/or jurisdiction of a particular state over which territory (and territorial waters) it lies.
The continuous broadcasting of sound via the Internet in the style of traditional radio.
The technology that allows for the transmission of sound or other signals by modulation of electromagnetic waves.
A device that can capture (receive) the signal sent over radio waves and render the modulated signal as sound.
A device that can transmit radio signals.
On-board entertainment system in a car, usually including a radio receiver as well as the capability to play audio from recorded media.
To order or assist (to a location), using telecommunications.
To use two-way radio to transmit (a message) (to another radio or other radio operator).