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Characteristics of the medium
From its first tentative experiments and the early days of wireless, radio has expanded into an almost universal medium of communication. It leaps around the world on short waves linking the continents in a fraction of a second. It jumps to high satellites to put its footprint across a quarter of the globe. It brings that world to those who cannot read and helps maintain a contact for those who cannot see.
It is used by armies in war and by amateurs for fun. It controls the air lanes and directs the taxi. It is the enabler of business and commerce, the essential for fire brigades and police, the commonplace of the mobile phone. Broadcasters pour out millions of words every minute in an effort to inform, educate ...
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