Why should you choose a Quad antenna over a Yagi?
More gain, lighter weight, smaller turning radius, better front to back ratio, better side rejection, less QRN (static), better reception, lower radiation angle, and will work efficiently at a lower elevation than a Yagi.
Will the quad work on vertical polarity ?
The polarity is a function of where the driven element is fed. All of our quad designs may be either Horizontal or Vertically polarized which is determined at the time of assembly.