December 12, 2008 4:00 AM PST
Each of the antennas has a 20-foot-diameter main reflector, as well as a smaller sub-reflector, which contains a specialized receiver covered to protect it from the weather. The antennas can rotate at a speed of about 4 degrees per second, meaning that they can shift from horizon to horizon in about a minute. The antennas work in pairs, and the value of the array is that it provides a large number of different pair combinations, a number that will increase vastly as the array grows.
Photo by Daniel Terdiman/CNET News
Caption by Daniel Terdiman
