STEM antenna

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Javelin sounding rocket nosecone with Canadian STEM deployable antenna is prepared for launch in 1961

De Havilland Storable Tubular Extendible Member being fitted to Javelin sounding rocket nosecone, Summer 1961.

Four Storable Tubular Extendible Members (STEM) inside the shell of satellite S-27 (Alouette 1)

Diagrams of De Havilland STEM antenna