Analog

Analog radio signals are made up of waves that have not been digitized – meaning that anyone with a compatible tuner can listen in. Analog radio is easy to eavesdrop upon, is a very inefficient use of spectrum, and it suffers from static and other interference – especially as distance increases.

The analog AMPS cellular network was at last fully shut down in 2008, but other wireless analog communication technologies remain – such as CB and ham radio.