Jansky radio antenna replica. Replica of the antenna used by Karl G. Jansky to discover the radio Universe. Affectionately known as 'Jansky??? Merry-go-Round', this antenna's turntable allowed Jansky to learn the direction of any signal he picked up. It was part of a program by Bell Laboratories to locate sources of 20.5 MHz radio signals that might interfere with their overseas wireless communications. He located thunderstorms and the famous hiss that he determined came from the center of our Milky Way galaxy. The discovery was widely publicized, appearing in the New York Times of 5 May 1933. Grote Reber suggested that this replica be built at the National Radio Astronomy Observatory (NRAO) in Green Bank, West Virginia, USA. It was built in the 1960s to exact specifications, down to sourcing old Model-T tires for the rotation axis. The antenna's wires are just visible against the clouds.