-Xnec2c is a high-performance multi-threaded electromagnetic simulation -package to model antenna near- and far-field radiation patterns for -Linux and UNIX operating systems. The original FORTRAN version of NEC2 -was ported to C by Neoklis Kyriazis, 5B4AZ and released as nec2c. Later -he wrote xnec2c, a graphical interface for ease of use with many more -features. +nec2c is a GUI interactive application that (in its current form) reads NEC2 +input files but presents output data in graphical form, e.g. as wire frame +drawings of the radiation pattern or near E/H field, graphs of maximum gain, +input impedance, vswr etc against frequency and simple rendering of the antenna +structure, including color code representation of currents or charge densities.