Carl, Here's a couple of pages off one of the Radio Caroline sites that talks about these RCA rigs: http://www.rossrevenge.co.uk/tx/antho.htm http://www.rossrevenge.co.uk/tx/ampli.htm Other pages from the above links. (((73))) -- Philip de Cadenet G4ZOW Transmitters 'R' Us http://www.transmittersrus.com