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Abstract
The sinusoidal-Galerkin moment method is developed for a vertical monopole antenna erected at the center of radial-wires over the flat earth. The asymptotic extraction method and the exact image method are used to obtain fast convergence of the Sommerfeld integral. Numerical results are presented for the impedance as functions of the number of the radial-wires, the height of the radial-wires, the length of the radial-wires, and the conductivity of the earth.