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The two vertically oriented half-wave dipoles separated by a distance of start fraction lambda over 2 end fraction. The length of the dipole array is lambda over 2. The array is connected with a source and a phase shifter. The array amplitude distributions of the dipoles are a sub 0 equals 1 and a sub 1 equals 1. The array phase distributions of the dipoles are psi sub 0 equals 0 and psi sub 1 equals negative start fraction pi over 2 end fraction.