RF range Calculator

For example, if your height of eye is 9 feet above the surface of the water, the formula would be: 1.17 times the square root of 9 = Distance to the horizon in nautical miles .

To calculate the range of an antenna, you multiply the square root of the antenna’s height above water (in feet) by 1.42 . The product will equal the antenna’s communication range in miles.12 Şub 2014

That formula is: Horizon in kilometers = 3.569 times the square root of the antenna height in meters . For example, if the antenna height of a radio is at 6 feet (1.82880 meters tall) the horizon is 2.99 miles away (4.83 kilometers) and another radio with the antenna at 6 feet, that equals approximately a 6-mile range.

So according to our rule-of-thumb, 2 people around 6 feet tall using a 5 watt handheld two-way radio, used on flat ground with no obstacles, will have a maximum range of approximately 6 miles .