Radio's history has been one of survival, resilience, expansion and continuing re-invention. While in the present no less than in the past, radio's innate flexibility and adaptability to new technology will ensure its ongoing relevance as a medium, this article considers the particular significance of specialist traditions and production cultures unique to a public service broadcasting "form" such as ABC Radio National (RN). Drawing on rich seams of historical and comparative research, and on past investigations of "cultural radio" developments and forms since the 1930s, the article examines the particular ecology of RN, and the role and legacy of journalists, producer-broadcasters, "creatives" and engineers who contribute to re-invention a...