Quarter Wave Ground Plane Antenna

Overview

For higher frequencies, you generally want to mount the antenna higher to get it above obstructions, etc. As a result, you can’t use ground-mounted radials. A solution is to create an antenna with integrated radials to generate a ground plane. Additionally, by angling the radials downward, the impedance is improved while improving the radiation angle of the antenna.

This is normally constructed with four radials equidistant around the radiator and a chassis-mount N-Type or SO-239 connector as the mounting location, and five pieces of wire for the elements.

Construction

Notes:

• Where dimensions (A and B) are in inches and the frequency (f) is in MHz.
• The N-type or SO-239 will need water proofing if left outdoors.