5/8 Wave Antenna Length Calculator

Formula

To calculate the length of a 5/8 wave antenna ( $L$ ):

$L = \frac{585}{f}$

Where:

$L$ is the length of the antenna in meters
$f$ is the frequency in MHz

What is a 5/8 Wave Antenna Length?

A 5/8 wave antenna length refers to a type of antenna design where the physical length of the antenna is 5/8 of the wavelength of the frequency it is designed to receive or transmit. This design is often used in vertical antennas for radio communication systems, as it offers a lower angle of radiation and greater range of signal compared to other designs. The 5/8 wave antenna is particularly popular in mobile communications, such as for car radios, because of its superior performance in transmitting signals over a horizontal plane.

Example Calculation 1

Let's assume the following values:

Frequency ( $f$ ) = 144 MHz

Using the formula:

$L = \frac{585}{144} = 4.06 \text{ meters}$

The length of the antenna is 4.06 meters.

Example Calculation 2

Let's assume the following values:

Frequency ( $f$ ) = 100 MHz

Using the formula:

$L = \frac{585}{100} = 5.85 \text{ meters}$

The length of the antenna is 5.85 meters.