 The specialised nature, limited spectrum and higher cost of DAB broadcasting equipment provides barriers to unlicensed ("pirate") stations broadcasting on DAB.In cities such as London with large numbers of unlicensed radio stations broadcasting on FM, this means that some stations can be reliably received via DAB in areas where they are regularly difficult or impossible to receive on FM because of interference from unlicensed radio stations.Mono talk radio, news and weather channels and other non-music programs need significantly less bandwidth than a typical music radio station, which allows DAB to carry these programmes at lower bit rates, leaving more bandwidth to be used for other programs.