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Herein is described a calculator that will aid the engineer in finding two- and three-element antenna arrays to meet his specific need. It can be constructed in a small pocket size for field estimation in adjusting arrays or in the form of a large instrument for precise calculations in design work. The operation of the machine in calculating ground-wave and sky-wave patterns is described, based on the radiation distribution of the various-height towers. The procedure is continued through the determination of the actual field strength to be expected from the array at any point, as well as the root-mean-square field strength of the system. The main idea is to proceed from the problem to the answer by the most direct method, while considering all the parameters.