Use this tool to calculate how far a VHF radio can transmit.

Enter the antenna height and pick the units (meters or feet).

**Formula**

**d = 4.12 * √h**

where **h** is the antenna height in metres and **d** is the distance in kilometres.

**Example Calculation**

For a height of **12 feet**, the range of a VHF radio system is **5 miles** or **8 km**. Note that this assumes no obstructions and no interference from other radios which will reduce the range.

**Background **

VHF (very high frequency) is the name for radio frequencies in the range between 30 MHz and 300 MHz. VHF signals are used for FM Radio, Two-way radio, television broadcasting, AIS and other applications.

**References**

[1] Line of Sight Propagation on Wikipedia