Enter the frequency into the calculator to determine the length of a 5/8 wave antenna. This calculator can also evaluate the frequency, given the length of the antenna is known.
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5/8 Wave Antenna Length Formula
The following formula is used to calculate the (free-space) length of a 5/8 wave antenna.
L = 187.5 / f
Variables:
- L is the length of the antenna in meters
- f is the frequency in MHz
To calculate the length of a 5/8 wave antenna, divide 187.5 by the frequency in MHz. The result will be the length of the antenna in meters.
What is a 5/8 Wave Antenna Length?
A 5/8 wave antenna length refers to an antenna design where the element is approximately 5/8 of the wavelength (in free space) of the frequency it is designed to receive or transmit. This design is often used for vertical antennas in radio communication systems, and when properly installed and matched it can produce a lower radiation angle than some shorter vertical designs. The 5/8 wave antenna is particularly common for mobile VHF/UHF radio applications where a longer whip is practical.
How to Calculate 5/8 Wave Antenna Length?
The following steps outline how to calculate the length of a 5/8 Wave Antenna using the formula: L = 187.5 / f
- First, determine the frequency (f) in MHz.
- Next, use the formula L = 187.5 / f to calculate the length (L) of the antenna in meters.
- Finally, calculate the length of the 5/8 Wave Antenna.
- After inserting the frequency 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) = 100 MHz → Length (L) = 187.5 / 100 = 1.875 m
