This photograph of a liquor store was taken in Minneapolis in 1939, and recently posted to Shorpy. Interesting, but... what is that futuristic thing sticking up out of the car parked in front?
The first comment on the picture identified the car as a new 1939 Mercury, and the second commenter asked about the flashy antenna. It didn't take long for someone to find another car with the same gadget, and another to find an advertisement for the exact radio and antenna. This kind of collaboration and information sharing is one of the things that makes the internet so addicting. Link -Thanks, Marilyn Terrell!