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An analysis of a comb antenna for reception of vertically polarized medium-frequency waves is given. The formula can be applied to any array in which the elements are arranged in a line and in which the current ratios and phase relations are known. Close coupling of the elements is considered, rather than very loose capacitive coupling. The condition of close coupling greatly increases the directivity and signal level by adjusting the line velocity to an optimum value. The antenna is especially suited for reception of Loran signals.