Program to calculate the dimensions of a resonant square 2-element quad
beam.
All equations calibrated to NEC antenna modeling software for wire
diameters from 3.16e-5 to 1e-2 wavelengths within about 0.5% from 3.5 to 250
MHz.
Original BASIC program by L.B. Cebik W4RNL
PHP4 port by Rich Alloway N3WWN