Agency:.Produced by the National Film Board of Canada for the Royal Canadian Air Force.

Director, René Jodoin ; producer, Frank Spiller ; executive producer, Peter Jones ; photography, Douglas Poulter ; sound editing, Claude Langlois ; animation, Bernard Longpré.

Narrator, Jack Curran.

Recorded 1960.

This film combines colour, animation and sound to clarify principles of radio wave transmission. It illustrates how antennas propagate radio waves and how they may be adapted to increase the bandwidth of transmissions. (The film was released for general use as a public service by the Royal Canadian Air Force.).

Mode of access: World Wide Web.

Description based on online resource; title from title screen (National Film Board of Canada, viewed 2023-08-10).