What is 5MBS? The Music Broadcasting Society of SA (MBS) was incorporated in March 1995, and has many hundreds of Members, and more than 100 volunteers dedicated to bringing you Fine Music on radio. 2. Broadcast Licence Following some test broadcasts from 1995, 5MBS operated from February 1998 under a series of Temporary Community Broadcast Licences (TCBLs) granted by the Australian Broadcasting Authority (ABA). The ABA called for applications for permanent licences in August 2001, closing in November. On 22nd August 2002 we were awarded a permanent 24 hour 7 day licence on a frequency of 99.9FM and resumed full ...