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The performance of a linear array of rectangular slots in a ground plane, covered with an inhomogeneous dielectric or plasma layer, is analyzed. The self and mutual admittances of the slots and the element radiation pattern are formulated for a given array configuration and external environment. The characteristics of the array are then determined for different types of feed networks. Traveling wave, standing wave, and free excitation are considered. Numerical and experimental results are presented for the gain, radiation pattern, and input admittance of a 10-element array in free space and in the presence of a reentry sheath.