J-Pole Antenna Calculator

Formula

The formula to calculate the J-Pole Antenna Length (L) is:

$L = \frac{468}{f}$

Where:

$L$ is the Length of the Antenna (feet)
$f$ is the Frequency (MHz)

What is a J-Pole Antenna?

A J-Pole antenna is a type of radio antenna that is widely used for its high performance and simple construction. It is named for its unique shape that resembles the letter ‘J’. The antenna consists of a long vertical section, a short horizontal section, and a matching section, which together form an end-fed omnidirectional half-wave antenna. It is commonly used in amateur radio, CB radio, and FM broadcasting due to its ability to provide a strong, clear signal over a wide range of frequencies.

Example Calculation

Let's assume the following value:

Frequency (f) = 144 MHz

Using the formula to calculate the J-Pole Antenna Length:

$L = \frac{468}{144} \approx 3.25 \text{ feet}$

The J-Pole Antenna Length is approximately 3.25 feet.