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How to calculate the transmission distance and antenna height of the transmitter and receiver? The table below is from our engineer.

HIV Distance (Km)	the sum of Antenna heights required To break through the curvature of the Earth (meters)
20	31.4
25	49.1
30	70.6
35	96.1
40	125.6
50	196.2

Fresnel Zone Calculator

The Fresnel Zone Calculator can be used to calculate the size of the elliptically shaped area of RF propagation between a transmit and receive antenna, also known as the Fresnel zone.