Grote Reber, born in 1911 and died in 2002, was an American engineer and pioneer of radio astronomy. This radio and amateur radio engineer discovered his vocation after learning about the work of the American radio engineer Karl Guthe Jansky.
In 1937 he began working on the construction of a strange metal plate that had a radio receiver attached to it. Reber had created the world's first radio telescope. His work revolutionized astronomical observation, marking one of the most important milestones from the Galileo optical telescope
Reber's radio telescope consisted of a nine meter diameter parabolic metal mirror, which was focused on a radio receiver eight meters above the mirror. After his first radial telescope he built two other receivers, the third being the most successful. Thanks to him, he was able to publish the first radio map of the Milky Way in 1944. It was published in the Astrophysical Journal during the same year, but his work aroused little interest among the astronomical community at that time.
Reber donated his telescope to the National Radio Astronomy Observatory, the National Radio Astronomy Observatory, which is located in Green Bank, in the state of Virginia. There it was mounted on a rotating table, so that it could move in any orientation.