How much gain does a 1/4 wave vertical antenna have?

How much gain does a 1/4 wave vertical antenna have?

So on a scale of dBd (gain referenced to a dipole) a 1/4 wave vertical has about -3 dBd (that is negative 3 dBd, less than one). On a scale of dBi (gain referenced to an isotropic) it is about -0.85 dBi.

How do you find the radiation pattern?

The far-field pattern of an antenna may be determined experimentally at an antenna range, or alternatively, the near-field pattern may be found using a near-field scanner, and the radiation pattern deduced from it by computation.

Is there a 1 / 4 wave ground plane antenna?

Fortunately there is an antenna that is inexpensive and simple to build with a minimum amount of parts and tools. That’s the the 1/4 wave ground plane antenna. Today we’re going to build a simple ground plane for the VHF 2 meter band. Ground plane antennas are easy to recognize by their appearance. First off you’ll notice the radiating element.

Is the 2 meter antenna a dual band antenna?

Dual Band Performance in a single antenna: Each antenna is individually tested and tuned for optimum performance on their respective bands. The two meter antenna is tuned to 146MHZ (1.2:1 SWR or less at 146MHz), and the SWR is 1.4:1 or less throughout the entire 2 meter band. This antenna also works great as a dual band antenna.

How many radials are in a ground plane antenna?

Next up are the ground radials. a ground plane will often have three or four radials, each 1/4 wavelength long. This particular ground plane is constructed out of an SO-239 chassis connector, so the radiator is attached to the center conductor of the connector and the radials each come off the base.

What should the SWR be on a 2 meter antenna?

Each antenna is individually tested and tuned for optimum performance on their respective bands. The two meter antenna is tuned to 146MHZ ( 1.2:1 SWR or less at 146MHz ), and the SWR is 1.4:1 or less throughout the entire 2 meter band. This antenna also works great as a dual band antenna.