Design and analysis of a low‐profile directive antenna array for multi‐element terminals - Brzezina - 2014 - IET Microwaves, Antennas & Propagation - Wiley Online Library
Cubical Quad Antenna Calculator - Resource Detail - The DXZone.com
PG1N's HAM Radio Site - 6m Projects - Directional Antennas
Quad Antenna On-line Calculator - Resource Detail - The DXZone.com