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The illustration displays two lobes and a short dipole in the center of a coordinate system. The lobes represent the radiation patterns of the short dipole, and labeled, F of theta. The horizontal axis labeled, theta equals 90 degrees (broadside). The half power beam width of the lobe labeled, beta equals 90 degrees. The one side of the half power beam width labeled, theta sub 1 equals 45 degrees. The other side of the half power beam width labeled, theta sub 2 equals 135 degrees. Two small arcs are highlighted, on the sides of the half power beam width at a distance of 0.5. The lobe labeled, F of theta.