Radio waves are the lowest frequencies in the electromagnetic spectrum, and
are used mainly for communications.
Radio waves are divided into:
Around 1~2 km in wavelength.
Around 100m in wavelength, used by BBC Radio 5 and
other "AM" stations.
This stands for "Very High Frequency" and has wavelengths
of around 2m.
This is where you find stereo "FM"
radio stations, such as BBC Radio 1and Further up the VHF
band are civilian aircraft and taxis.
This stands for "Ultra High Frequency", and has wavelengths
of less than a metre.
It's used for Police radio communications,
television transmissions and military aircraft radios - although
military communications are now mostly digital and encrypted.