Antenna closeup, northwest face (1982).

• Each of the four phased array antennas contained more than 5,000 array elements, was 13 feet in diameter, and weighed over 400,000 pounds.
• The radar could continue to function even after the loss of some of the individual array elements.
• The smaller antenna array located to the lower right of the main array was the Q-channel antenna. Its purpose was to reject or "blank" signals received on the array sidelobes (portions of the antenna response pattern not contained in the main beam).
• The pipes and nozzles around the perimeter of the antennas were the antenna washdown devices. Their purpose was to wash and/or de-ice the antenna face/elements with a cleaning/de-icer solution.
• The white plug-like device to the lower left of the main array was the exterior control for the antenna wash system.
• Description from Clint Esckilsen and ABM R & D at Bell Labs.