And so, this is radio broadcasting in the 1920s: On one side of the Atlantic, in the geographically vast United States, isolated clusters of local and mostly amateur operators, inspired by the enthusiasm of the hobbyist and a somewhat vague though earnest idea of national betterment. In Britain, a private monopoly, with national reach, arguably elitist but unquestionably and systematically dedicated to bringing “the best of everything” to the general public. In either setting, the medium would never be more hopeful or high-minded.

