2-Element Quad Antenna
2-element quad antennas are very popular due to their compact size and gain similar to a more element Yagi. In addition, they can be designed to obtain an input impedance of 50 Ohm.
This design can operate at 27.5 MHz. We have added a script that allows us to plot the gain and front-to-back ratio as a function of element spacing. See this video >.
To create the Scilab script, you can start from a basic design in AN-SOF and then export it as a *.sce file going to File menu > Export Wires.