The directivity gain and the input impedance of a Yagi-Uda antenna is
The antenna sits in the x-z plane.
Specify the frequency (in MHZ) at which the antenna will operate, the length
of the three wires, the distances between them (in meters) and the radius of the
wire "wirad" (in millimeters).
This script was developed at the Center for Computational Electromagnetics (CCEM)
in the University of Illinois at Urbana with funding from the Sloan Center
for Asynchronous Learning Environments(SCALE).