Daily Facts
Content previously syndicated to other websites

Measuring Tree Branch Height

March 20th Fact-of-the-Day

Trees often support the ends of wire antennas. Regardless of whether a tree is climbed, a weight is thrown, an arrow is shot, or a gas-filled balloon is used to get a line over a high branch, it can be difficult or impossible to directly measure the height of a branch above ground, because of interfering branches below. However, the trigonometric tangent function provides a way to determine the height indirectly. If the ground is level, measure a convenient distance (such as 75 feet) from a point on the ground directly below the branch to a point away from the tree, where the branch can be seen. Then measure the angle from the ground to the branch at that distance and apply this formula: height = tan(angle) x distance ©2005 Martek International All rights reserved.

Search other ham radio sites with Ham Radio Search