Transmission distance and antenna height

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

傳輸距離 (千米)	the sum of Antenna heights required To break through the curvature of the Earth (米)
10千米	7.8 儀表
20千米	31.4 儀表
25千米	49.1 儀表
30千米	70.6 儀表
35千米	96.1 儀表
40千米	125.6 儀表
50千米	196.2 儀表
60千米	282.5 儀表
70千米	384.5 儀表
75千米	441.4 儀表
80千米	502.3 儀表
90千米	635.7 儀表
95千米	708.2 儀表
100千米	784.8 儀表
110千米	949.5 儀表
120千米	1130.0 儀表
130千米	1326.2 儀表
140千米	1538.0 儀表
150千米	1765.6 儀表

如果我想轉發 100 kilometers but don’t want the drone to fly too high, what is the solution? 此時, you can consider adding a drone relay. 無人機中繼器中繼解決方案

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.