Antenna modeling used to be the domain of scientists and engineers with very expensive antenna ranges covering acres and acres of land strewn with expensive equipment. With the proliferation of personal computers and affordable (even free) software, antenna modeling has become a popular amateur activity. With modeling you can determine the pattern, feed point impedance and even the SWR of your antenna system before cutting one piece of wire or one tube of aluminum. This can save an awful lot of tree and tower climbing.

• A Beginner's Guide to Modeling with NEC, Part 1
  QST November 2000, pp. 34-38
• A Beginner's Guide to Modeling with NEC, Part 2
  QST December 2000, pp. 40-44
• A Beginner's Guide to Modeling with NEC, Part 3
  QST January 2001, pp. 44-48
• A Beginner's Guide to Modeling with NEC, Part 4
  QST February 2001, pp. 31-35
• MININEC: The Other Edge of the Sword
  QST February 1991, pp. 18-22
  MININEC software is powerful, but you need to know its limitations.
• A Beginner's Guide to Transmission-Line and Antenna-Tuner Modeling
  QST May 2001, pp. 34-37
  Using the new TLW software bundled with recent editions The ARRL Antenna Book

http://www.qsl.net/4nec2/

4nec2 is a free Windows based antenna modeler and optimizer.

·         Nec2go
Simplified Nec2 modeling for amateurs and professionals. Free demo.

·         MM Hamsoft
Includes free Mininec based Antenna Analyzer

·         EZNEC Antenna Software by W7EL
EZNEC 7.0 is now a free download.  Author no longer provides support as he has retired.
Sample EZNEC Files

·         The unofficial Numerical Electromagnetic Code (NEC) Archives
Additional information not found in the NEC-2 manuals.

·         MININEC Pro Antenna Analysis Software
Antenna analysis program for Windows and Macintosh computers.

·         Antenna Modeling Software &Other Utility Programs
by Dan Maguire, AC6LA

·         Antenna Modeling Files
To be used with either NEC-4 or Yagi Optimizer modeling programs.  While YO is no longer available, .YAG files can be converted using the MS-DOS based SCALE.exe program that appears in the YAGIS subdirectory when YW is installed.  YW comes with the ARRL Antenna Book.

·         G4FGQ's Software
G4FGQ's Software -- A collection of free engineering/modeling programs written by Reg Edwards G4FGQ.

·         Yagi Antenna Design
Justin G0KSC has videos, drawings, and photos to assist hams homebrewing antennas.

·         EZNEC tutorials by Steve G3TXQ.

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.

Official web site https://www.xnec2c.org/

• Github: https://github.com/KJ7LNW/xnec2c

• https://github.com/KJ7LNW/xnec2c-optimize