Use this tool to calculate how far a UHF radio can transmit via Line of Sight.
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 6 feet, the range of a UHF radio system is 4 miles or 6 km. Note that this assumes no obstructions.
Background
UHF (ultra high frequency) is the name for radio frequencies in the range between 300 MHz and 3 GHz (3,000 MHz). UHF signals are used for television broadcasting, cell phones, satellite communication, wireless LANs, Bluetooth devices, two-way radios and other applications.
What is line of sight?
“Line of sight” (LOS) refers to an unobstructed straight path between two points, typically used in the context of telecommunications, broadcasting, and navigation. It is defined as the direct, clear path between a transmitter and receiver without any obstacles that could block the signal. This term is widely used in wireless communication, radar, and satellite technologies.
References
[1] Line of Sight Propagation on Wikipedia