1927 z "Jan 1919 _ music , sports , information , every home should have a radio."
" first woman to broadcast"
1934z old timer talking about Antenna on roof of building in Pittsburg. ( Wikipedia confirms KDKA "shack on the roof of k bld Westinghouse)
1943 development of advertising
1949 old timer talking about dx in the 20s when "there weren't so many wires around"
1957 Wor chief engineer. NBC chimes
2019 Jack Benny shows et al
2037 Hindenburg broadcast
2038 loss of audio / tones
2047 strong data bursts s9
s3 +noise at first, s7 good audio after 2020