20-meter 6-element quad at 95' above average ground
The Cubical Quad or Quad antenna has traditionally not been as widely used as its more popular cousin the Yagi. However the cubical quad beam antenna is able to provide some advantages in a number of circumstances.
Since its first introduction in the 1940s, the quad antenna has found uses in a number of areas. It has been used for some television antennas, but it has also seen a lot of use within amateur radio applications for use at HF and VHF / UHF.
Although the cubical quad antenna is not nearly as widely used as the Yagi, it still has advantages and can be used to good effect in many instances.
Directivity – Extremely high front-to-back and front-to-side ratios. 30 to 50 db rejection for interference-free reception.