Agency:.Produced by the National Film Board of Canada for the Canadian Department of National Defence.

Director, René Jodoin ; producer, Frank Spiller ; executive producer, Peter Jones ; photography, Douglas Poulter ; animation, Austin Campbell.

Narrator, Bill Walker.

Recorded 1960.

Combining colour, animation and sound to clarify principles of radio-wave transmission, this film illustrates how antennas propagate radio waves and how they may be adapted to increase the directivity of transmissions. The theoretical concepts are emphasized.

Mode of access: World Wide Web.

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