The Swiss Quad Antenna at ZS6PP, September 1967 QST - RF Cafe
Cubical Quad Antenna
easy quad calculator enter center frequency to get a quad antenna size. This resource is listed under Antennas/Antenna Calculators | Antenna, Quad, Antennas
The Ultimate Guide to 11 Meter CB Antennas
Hybrid Double Quad Antenna 2m 2/HDQ5
2 Meter 3 Element Quad Antenna Project - Direct Feed!