On Friday night, March 28, the Army took over and began operating a new radar installation four miles west of Green Lake on the crest of a hill along Highway 73, a quarter mile south of its intersection with 23. The site was being rapidly completed as a radar antenna delivered in sections by truck was mounted on a concrete base; its screen measured 44 feet wide and 11 feet high, and the antenna turned at six revolutions per minute to detect aircraft by radiation reflection. An auxiliary building housed a generator and convertor so the unit could run on commercial power and continue operating if Wisconsin Power and Light lines failed, while the main building contained crew, viewer, and control rooms. Equipment in the control room, including the radar set, modulator, power supply, and I.F.F. receiver and transmitter, had been flown in by helicopter. In the viewer room, the planned position indicator could spot aircraft ranging from a Piper Cub to a large airliner. The installation operated during standby and surveillance periods, was enclosed by a security fence, and had a small gatehouse used by the power company for meter readings. The men assigned to maintain the radar operation moved into the Floyd Kallas home in Green Lake on Tuesday after spending the previous four months together in Menomonee Falls, Wisconsin. The section included a chief radar operator, radar maintenance personnel, radar operators, generator operator maintenance personnel, cooks, and a cook's helper, while Warrant Officer Woods, Section Leader Hudson and his family, and Signal maintenance Lenz and his family took up residence in nearby homes.