The DRM is the only digital broadcasting standard for all radio frequency bands, in both AM and VHF (I, II and III frequency bands). A very short answer is that the FM transmissions can cover areas of tens of kilometres, while Band III offers basically line of sight coverage. DRM slots can be fitted in even in a very crowded or full FM spectrum (band II), which is the case in many big cities nowadays. But in the guard spaces necessary for guaranteeing no interference between analogue FM stations there is enough spectrum for fitting DRM slots. One DRM slots requires only 100 kHz (half that needed for an analogue local FM transmission) without endangering any analogue programmes on the air. We can say band III is super local and can be used for audio broadcasting only when the band has been freed by analogue television which might or should have migrated to digital. DRM works in both band II and III though most of the tests, demonstrations and transmissions have been, so far, mainly in band II (FM).