On the first warm weekend eighty years ago, this couple were taking their portable radio for a spin around the lake.  It was pulling in the stations thanks to their foresight in bringing it in to the dealer for a free check of the battery and tubes, and a reasonably priced tune-up.

This promotional poster appeared in the March 1940 issue of Radio Retailing.  Presumably, the dealer cut the page out of the magazine and put it in his window or bulletin board.  He then sat back and waited for the portables to start flooding into the store.