Communication Range (Line of Sight) (d = √(2Rh))
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d = √(2Rh)
What each symbol means
| Symbol | What it stands for |
|---|---|
| R | Earth's radius ≈ 6.4×10⁶ m |
| d | Maximum line-of-sight distance (m) |
| h | Antenna height above ground (m) |
When to use this
For two antennas: d_total = √(2Rh₁) + √(2Rh₂). Used for space wave (TV, FM) propagation. For h = 100 m: d ≈ 35.8 km. Valid for frequencies > 40 MHz.