Will the portable reach the repeater from here? Combine the radio horizon with a free-space link budget to estimate usable range for public-safety radio.
Radio Range / Link BudgetLive
VHF/UHF horizon + path loss
Estimated usable range
9.7mi
Controls
Presets
Combines the radio horizon (1.23·(√h₁+√h₂), feet→miles) with a free-space link budget (EIRP minus path loss vs receiver sensitivity). Actual range depends on terrain, foliage, and buildings — treat this as a best-case planning estimate.
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How it works
Usable range is the smaller of two limits: the line-of-sight radio horizon set by antenna heights (1.23·(√h₁+√h₂) in miles for heights in feet), and the distance at which free-space path loss drops the signal below the receiver's sensitivity. Real terrain, foliage, and buildings shorten this — treat it as a best-case planning estimate.
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