3/4 Wave Length Vertical
The 3/4 Wave Vertical
Ground Plane Antenna
The Vertical 3/4th Wave Ground Plane antenna has a gain of 7.2dbi over isotropic source.
The center conductor goes to vertical element and the outer conductor (braided wire) goes to the horizontal element. The Vertical Ground Plane antenna impedance averages 50 ohms, and can range from 36 ohms to 72 ohms depending upon the transmission line used.
Separation of the center and outer conductor where the coax or other feedline connect should not extend beyond 1" inch. Vertical antenna's ground elements are always 1/4 wavelength. Always mount the Vertical Ground Plane antenna at least it's total length, or greater height above the ground or building for best results.
Note: The 3/4th wave vertical ground plane does not need any matching system.
The center conductor goes to vertical element and the outer conductor (braided wire) goes to the horizontal element. The Vertical Ground Plane antenna impedance averages 50 ohms, and can range from 36 ohms to 72 ohms depending upon the transmission line used.
Separation of the center and outer conductor where the coax or other feedline connect should not extend beyond 1" inch. Vertical antenna's ground elements are always 1/4 wavelength. Always mount the Vertical Ground Plane antenna at least it's total length, or greater height above the ground or building for best results.
Note: The 3/4th wave vertical ground plane does not need any matching system.
To get the inches instead of a decimal point, just subtract the feet, and multiply 12 times the decimal point left over.
Each leg of the ground plane elements are formulated by: 234/frequency in MHz.
The formula for the driven element is 702/frequency in MHz.