NEC based antenna modeler and optimizer

by Arie Voors



4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced antenna modeler.


When running frequency sweeps, linear or logarithmic style SWR, Gain, F/B-ratio and impedance line-charts are produced. With the included Optimizer and Sweeper one is able to optimize antenna- and/or other environment-variables for Gain, resonance, SWR, efficiency and/or F/B, F/R-ratio. With the sweeper one is able to graphically display the effect of changing one or more of these variables for a specified range of values/frequencies.


For the starting modeler a graphically based 3D geometry-editor is included which requires no additional NEC knowledge while still enabling you to create and visualize and compare current-distribution, far/near-field patterns and Gain/SWR charts. More experienced modelers can use the gradient style and/or the genetic algorithm based optimizers to improve their designs.


To list some of its features or see some screenshots, click the appropriate links below on the left. To download and try the software click upmost two links below on the right (setup.exe) or the third link for a single zip containing all separate files.

NOTE: When experiencing problems running 4nec2, please consult the 'List known bugs' page on this website for latest news.








List features


Latest 4nec2 version (5.9.3)

View screenshots


4nec2 files as a ZIP (no install) (5.9.3) 

Show release notes



List known bugs


(4)Nec2 support files 






Gnuplot 2D/3D plotting 

4NEC2 Tutorials


ItsHF propagation prediction 




Links and other stuff


HAM-magazine article in Dutch 




Contact author 







4nec2 Forum

New 4nec2 Forum


  last revised: Apr 28, 2021 (see release notes)



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