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The distance at which a direct radio wave can reach a receiving antenna of given height from a transmitting antenna of given height. Note: The radio horizon range in nautical miles, R , is given by the relation R = 1.23(h t1/2 + h r1/2), where h t and h r are the heights of the transmitting and receiving antennas in feet. The radio horizon range, R , in nautical miles is also given by the relation R = 2.23(h t1/2 +h r1/2), where h t and h r are the heights of the transmitting and receiving antennas in meters. The effective Earth radius, 4/3 times the actual Earth radius, is used in deriving the formulae. Second-order differentials are neglected. They are of the order of 0.1%. [From Weik '89]