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It's an optical Line-Of-Site formula with 15% Over-The-Horizon factor added used for Two-Way radio calculations. As I said it's only a rough estimate. It would take an extensive propagation program to provide a more accurate answer. As to where it originated: In Antenna Theory 101 in Engineering school. You can also Google the formula.

[QUOTE="KC9Q, post: 356104, member: 23691"] It's an optical Line-Of-Site formula with 15% Over-The-Horizon factor added used for Two-Way radio calculations. As I said it's only a rough estimate. It would take an extensive propagation program to provide a more accurate answer. As to where it originated: In Antenna Theory 101 in Engineering school. You can also Google the formula. [/QUOTE]

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