The minimum antenna height at each end of the link for paths longer than seven miles (for smooth terrain without obstructions) is the height of the First Fresnel Zone plus the additional height required to clear the earth bulge . The formula would be:
H = 43.3 √ (D/4F ) + D2/8
Where,
H = Height of the antenna (in feet)
D = Distance between antennas (in miles)
F = Frequency in GHz
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