This memo presents some preliminary 50-antenna configurations prepared for the RAL review of configuration science requirements in October, 2000. Three configurations which fit on the available land at Hat Creek are examined: two with antennas uniformly distributed (with contrasting spatial resolution), and one with a doughnut shape. The u-v point density of the arrays is used for array comparison. Actual ATA array configurations will have many more antennas. 1. Introduction Recent negotiations have secured additional land for the ATA from the Bidwell Ranch. It is also planned to place antennas on new land from the US Forest Service, and the existing HCRO leases from Bidwell Ranch and the USFS. These leases are shown in figure 1. Within the constraints of the available land, an array configuration must be designed that best meets the objectives of the SETI Institute and the RAL research programs. This memo presents and analyzes some sample configurations. Two alternate configura..