What is the length of a quarter wave antenna?

3 to 6 inches
Since the UHF band covers a much larger range of frequencies than VHF, 1/4-wave antennas can range anywhere from 3 to 6 inches (7-15 cm) in length, so using the proper length antenna is somewhat more important. For a system operating at 500 MHz, a 1/4-wave antenna should be about 6 inches (15 cm).

How do you calculate 1 4 wave antenna?

Quater-wavelength in meters: 71.5 / frequency in MHz To use the calculator, enter the desired operating frequency in megahertz to get a starting length in both feet and meters for building a quarter-wave vertical antenna .

What is gain of a 5’8 wave antenna?

5λ/8 vertical antenna gain In an ideal world, it is found that a five eighths wavelength vertical antenna could exhibit a gain of close to 4 dBd, i.e. 4 dB gain over a quarter wave vertical.

Does a quarter wave antenna need a ground plane?

Does a 1/4 wave antenna need a ground plane? Answer: Yes. All 1/4 wave antennas work best if they are installed in the center of a metal ground plane with at least 1/4 wave length radius (1/2 wave length diameter: ~6 inches for 900Mhz and ~3 inches for 2.4Ghz); larger is better.

What is the difference between 1/4 wave and 5/8 wave antenna?

In the real world the actual gain difference between a 1/4 wave antenna and a 5/8th wave can be anywhere from no gain or a very slight loss up to a maximum of 2dB gain over a 1/4 wave. The 5/8th wave is never really worse, explaining why people have no problems using them. This is true for any repeater antenna height.

How is antenna factor calculated?

Wikipedia defines antenna factor as “the ratio of the incident electromagnetic field strength to the voltage V (units: V or µV) on the line connection of an antenna. For an electric field antenna, field strength is in units of V/m or µV/m, and the resulting antenna factor AF is in units of 1/m: AF = E/V.