Radio horizon
Smooth-Earth line-of-sight estimate between two antennas.
Typical radio horizon--
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Radio Horizon and Line-of-Sight Calculator
Estimate smooth-Earth radio and geometric horizon distance from two antenna heights.
About this calculator
How to use it
Enter both antenna heights above local ground to estimate the combined radio horizon.
Understanding the result
The result assumes smooth terrain and standard atmospheric refraction. Hills, buildings and unusual propagation conditions are not included.
More ham radio calculators
Use this calculator as a practical starting point. Check critical radio, electrical and installation work with suitable test equipment and current licence requirements.