Founded by Martin Rattle, the station started transmitting on 26 December 1979 and was shut down in 1996, as it was no longer financially viable.
While this station is off the air now, an archive web site (Capital Radio 604) exists that contains many photos, video, jingles, and recent interviews with ex-604 personnel.
Some of the household names who presented shows on Capital included Alan Mann, Dave Simons, Steve Smith, Darren Scott, John Berks, Jim Ellery, Tony Newman, Martin Bailie, Oscar Renzi, Kevin Savage, Tony Murrell, Alan Khan, Dave Guselli, Allan Pierce, Steve Crozier, Justice Ramahlola, Steve Bishop, Lee Downs, Barry Lambert, Wolfman Jack, Richard Jones, Kenny Maistry, Jeremy Mansfield, Tony Blewitt, Brian Oxley, Treasure Tshabalala and former Magic 1548 Liverpool presenter Richard Jardine, brother of ITV1 Formula One pundit Tony Jardine.
The news department boasted a team of experienced radio journalists including Will Bernard, Gary Edwards, Julian Potter as well as Paddi Clay, Gwen Lister, Michael Letellier, Mike Hanna, David O'Sullivan, James Lorimer, Manu Padayachee, Zahed Cachalia, Nigel Wrench and Beatrice Hollyer.
It later included Reuben Goldberg, Cassandra Moodley, Jeremy Thorpe, John Maytham, Andrew Bolton and Shaun Johnson