First released in 1955, the Huffy Radio Bike featured a real, working AM radio inside its body, powered by batteries held in a rear rack carrier, with signals received by an antenna wired inside the frame.
From a contemporary ad in Boys Life: "Not a toy. Powerful radio has lock, sensitive tuner, volume control, clear-tone speaker. The bike's a beauty; streamlined design, gearshift, new easy-pedal tires."
Huffy later made strap-on plastic models for other bike models, but they just aren't the same.
More Pictures [Nostalgic.net]
Previously: Cy-Fi: Wireless iPod Speakers for Bicycles [BBG]