Enter the frequency into the calculator to determine the length of an End-Fed Half-Wave antenna. This calculator can evaluate either variable given the other is known.

## Efhw Antenna Formula

The following formula is used to calculate the length of an End-Fed Half-Wave (EFHW) antenna.

L = 468 / f

Variables:

- L is the length of the antenna (feet) f is the frequency (MHz)

To calculate the length of an EFHW antenna, divide 468 by the frequency in MHz. The result will be the length of the antenna in feet.

## What is an Efhw Antenna?

An EFHW (End-Fed Half-Wave) Antenna is a type of radio antenna commonly used in amateur radio. It is designed to be fed at one end, hence the name, and is typically half the length of the radio wave it is intended to transmit or receive. This design allows for efficient operation and a relatively simple construction, making it popular among radio enthusiasts. The antenna can be installed in various configurations such as vertical, horizontal, sloping, or as an inverted V depending on the available space and specific needs.

## How to Calculate Efhw Antenna?

The following steps outline how to calculate the length of an Efhw Antenna using the formula: L = 468 / f.

- First, determine the frequency (f) in MHz.
- Next, use the formula L = 468 / f to calculate the length of the antenna (L) in feet.
- Finally, you have calculated the length of the Efhw Antenna.
- After inserting the frequency value and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

frequency (f) = 14 MHz