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The design, development, and testing of a digital tracking array is described. The array operates at 2.4 GHz for tracking video and data from UAVs and other mobile transmitters. A monopulse tracking technique is used to keep the beam scanned to the direction of the incoming signal. The array is built entirely of commercial off-the-shelf (COTS) components. Calibration, measurement of patterns, and verification of the tracking function are also discussed.