The AN/FPS-7 Radar was a Long Range Search Radar used by the United States Air Force Air Defense Command. In the mid-1950s General Electric developed a radar with a search altitude of 100,000 feet and a range of 270 miles. This radar was significant in that it was the first stacked-beam radar to enter into production in the United States. The antenna was fed signals from several feed horns arranged in a vertical stack, producing a series of horizontal beams separated vertically in space. By comparing the returns from the different feeds, altitude information could be determined without the need for a separate height-finder radar.