I found this postcard online and thought it perfect for the day. It is an old American Sunday School Union postcard from the late 1920's. When I was a girl my family attended a church in the hills sponsored by that very organization.
National Radio Day has more modern origins! It seems to have been kicked off in the 1990's when radio station personnel began talking about creating a holiday just for them. Though there are no congressional records or presidential proclamations designating August 20th as National Radio Day, it seems to have become a well-known holiday in its own right.
The invention of the radio dates back to the late 1800s. A number of inventors were responsible for the inventions and discoveries required to make the radio a reality. This included both transmission and reception methods and technology. The radio evolved from the telegraph and the telephone and the early wireless telegraph.
Happy National Radio Day and Post Card Friendship Friday!
To see more mailboxes and all things postal, visit Gemma at Greyscale Territory for Weekend Mailbox.