NEC-4 (and its recent update, NEC-4.2) is a significant upgrade over NEC-2 for professional and advanced amateur radio use:
To download the NEC-4 antenna modeling software, you must obtain a license directly through the Lawrence Livermore National Laboratory (LLNL) Software Shop . nec4 antenna software download
Unlike the older NEC-2 version, which is public domain, NEC-4 is proprietary and subject to United States export controls. Licensing and How to Get NEC-4 NEC-4 (and its recent update, NEC-4
: Individual licenses for personal use typically start at approximately $110.00 for a 3-year term. NEC-4 (and its recent update
: The 4.2 version includes a superior ground model for more realistic environment simulations.