The directivity gain and the input impedance of a V dipole are computed.
The two arms have the same length.
The V dipole sits in the x-z plane.
Specify the frequency (in MHZ) at which the antenna will operate, the length
"lgth" of the two wires (in meters), the angle between them (in
degrees) and the radius "wirad" of the wire (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).