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VHF Range calculations
Whilst every care has been taken in the preparation of this information, Sailtales.co.uk can accept no responsibility for any errors or ommisions. | |
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VHF radios have to be in 'line of sight' of each other in order to communicate. Even at their high power
setting and with no obstructions they are limited by the curvature of the Earth and the height of the aerial above sea level.
The range of your VHF radio for a given aerial height can be obtained from the following formula;
Range in miles = 2.21 x √aerial height in meters 
The receiving radio will, of course, have it's own range which increases the effective range of the two sets when communicating with each other. To calculate the effective maximum range of the two stations simply add their ranges together.
Effective range in miles = (2.21 x √transmitting aerial height in meters) + (2.21 x √receiving aerial height in meters) | |
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