The origin and growth of information broadcasting (chiefly of propaganda) by radio - most renowned for its prominence in World War II and the Cold War - is outlined. The author chronicles the technological and engineering achievements that enabled long-range broadcasting to develop, but keeps them in the context of the social and political environment of the day. The appeal of the book is by no means restricted to scientists and engineers, and many will find much to stir their own memories of international radio broadcasts in wartime and peacetime alike.