Communication · 1920
Broadcast radio
KDKA airs the US election returns, and scheduled broadcasting reaches the home.
After Reginald Fessenden's experimental voice broadcast of 1906, Pittsburgh station KDKA began regular commercial broadcasting on 2 November 1920. Within a decade tens of millions of homes owned receivers; radio created national audiences for news, music and politics.
What it built on 3
Related measurements
The dashed line marks when it first worked.
US households with a radio Latest: 99 % of households (2005) Source: Our World in Data