Australia's dual system of broadcasting has provided national and commercial radio services to Australians in both urban and remote areas. Networks were formed to serve these areas, but advertising agencies tended to dominate smaller commercial networks on behalf of their clients. Most of these failed. The Macquarie Broadcasting Service Pty. Ltd. (MBS) network began in 1938 and offered network programming and sales representation to stations affiliating with them. Its subsidiary, Artransa Pty. Ltd., also produced and syndicated programs and provided sales representation both nationally and internationally. This study concludes that MBS' contribution to Australian commercial broadcasting was the development of networking and that it had the greater listenership of any commercial network in this time period.