Plan 59 is a great site where you can check out nostalgic images of the mid 1900s. It has mostly 1950s commercial art, a form that has almost been entirely lost. If you are a car fan, you’re going to love a lot of the images here.
The sections are Cars, Wagons, New, Photos, Trucks, Eh?, Décor, Old Ads, The DT's (Demonic Tots) and Food. It pretty much covers the the advertising spectrum from the 50s. Some of the kids are quite scary looking. See how advertising has changed over the years.
I haven't taken the time to check out every picture, but unfortunately, at first glance I didn't notice any radio-related pictures.
http://www.plan59.com/main.htm