Emergency Communication Range Calculator
Estimate two-way radio range for emergency communications based on power, antenna height, terrain, and frequency band.
Inputs
Results
Effective range (mi)
3.55
Line-of-sight range (mi)6.96
Coverage area (sq mi)39.54
HF skip range (mi)0
Range w/ 100ft antenna (mi)9.02
Repeaters for 100 sq mi3
Est. battery life (hrs)30.3
How to Use This Calculator
- Enter your Transmit Power (watts) and Antenna Height (ft).
- Input the Remote Antenna Height (ft) at the other end of the link.
- Select Terrain Type (flat, rolling, hilly, mountainous, or urban).
- Choose the Radio Band (VHF, UHF, 700 MHz, or 800 MHz).
- Review Effective Range (miles) and Line-of-Sight Range to plan repeater placement.
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