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White-space devices

Various proposals, including those from the White Spaces Coalition, have advocated using white spaces left by the termination of analog TV to provide wireless broadband Internet access. However, these efforts may impact wireless microphones, medical telemetry, and other technologies that have historically relied on these open frequencies.

A device intended to use these available channels is a white-space device (WSD). These are designed to detect the presence of existing signals, such as TV stations and other wireless users, and to then avoid the use of these channels. Early ideas proposed including GPS receivers and programming each WSD with a database of all TV stations in an area, however this would not have avoided other non-stationary or unlicensed users in the area, or any stations licensed or altered after the device was made.

Source: http://en.wikipedia.org/wiki/White_space_(telecommunications)#White-space_devices