Radio is still one of the most popular and affordable mass media.
The radio commercial broadcasting model served as an inspiration for theTV broadcasting model. Reginald Fessenden was the first person to superimpose voice on the radio waves, in 1906. The Lee De Forest audion tube made voice transmission clearly intelligible, in 1910. FM transimissions have superior clarity and fidelity. Frank Conrad transmitted regular radio programming from his house, in Pittsburgh, in the late 1910s.