Both are effective antennas, sans dipole feed problems. Notable commercial examples of this trend are the log-periodic Yagi (using a log-periodic type broadband feed) and a 20 element colinear with yagi type directors. In fact, some of the best VHF-UHF antennas these days, both homemade and commercial, are hybrid designs that avoid the problems inherent in a Yagi type dipole driven element by not using one! Gamma matches tend to become less than effective at these frequencies, and other feed methods such as the delta with a balun and universal stub lead to cumbersome antennas that may not endure rough handling or wet weather. As many antenna builders have learned, matching a Yagi at VHF (and especially at UHF) is not easy. With Yagi type directors, the quagi retains the simplicity and gain of a long boom Yagi without the Yagi drawback at VHF – a dipole driven element.

The antenna’s secret, if there is one, is its hybrid character. The elements can be bent and straightened without affecting the gain or VSWR. Many of these antennas have survived several years of bouncing up and down mountain roads that are little more than goat trails. The Quagi requires neither fine tuning nor careful handling. But equally important, the quagi can be built by the average amateur with simple materials at a fraction of the cost of a commercial antenna. At frequencies above 144 MHz, only larger and very well tuned antennas tend to outperform the eight element Quagi. The result is an antenna that has outperformed all similar size conventional Yagis and a number of bigger ones at three VHF conferences where antenna gains were measured.

This article describes an eight element quagi design with quad type driven element1 and reflector plus six Yagi type parasitic directors. Well, here are the “true” facts, the real dope, the hot scoop.Īs its name suggests, the quagi combines the best features of the cubical quad and the linear Yagi-Uda beam antenna. There have been many half-hearted attempts to combine a Yagi and a Quad. The VHF Quagi from an article by Wayne Overbeck, K6YNB in QST April 1977 “Building a 440MHz Quagi” description is from Gary Bonnor – VK4ZGB

Quagi antenna calculator