A Broadcaster is like the content of a writeup: they provide and broadcast the content of a radio show. That means they do a lot of research off air, and include news, interviews, informative documentaries, debates and other diverse programmes in their show. They are usually pretty good journalists. Sometimes a broadcaster even hosts a talkback radio show. If a broadcaster is more like a heading, then they are a Continuity Announcer.
Good intelligent radio broadcasting still has it's place in society today, and can be innovative and comprehensive.