Task Description: This task supports an ongoing Earth Science Technology Office joint project between the NASA GRC and GSFC to develop low-cost tracking ground stations using arrayed antennas. This particular task involves the assembly and verification of the previous Direct Data Distribution (D3) experiment tracking pedestal hardware. The work includes the reintegration of all pedestal hardware and field verification by using said hardware to optically track a low-Earth orbiting satellite such as EO-1 or SAC-C. The final phase of this task requires support of an experiment to be conducted at Georgia Tech (Atlanta, GA) in approximately the early May, 2005 time-frame. That experiment is expected to last approximately one week and entails establishing an X-band communications link between four inflatable membrane antennas mounted on the D3 pedestal and the SAC-C satellite. NASA GRC will provide the 4 inflatable antennas and pedestal adapting plate. Georgia Tech will develop the adaptive software to allow the four arrayed antennas to function as a coherent aperture.