His older versions will not work in Windows 7 and 8. 5 ($89) EZNEC+ v.5 ($139) EZNEC Pro/2 v.5 ($500) Demo 2.0.10 Dan Maguire AC6LA -.weq (AutoEZ).ez (EZNEC).nec.ant (AO).inp.maa (MMANA-GAL).weq (AutoEZ).ez (EZNEC) Demo - Free full version - $79 6.2.0 Paul McMahon VK3DIP includes sample Yagi files.yc6 (YagiCAD).yag (YagiCAD).yc6 (YagiCAD).nec.nec (4NEC2).txt Free 2.0 Dean Straw N6BV -.yw (Yagi for Windows).yag (YO).yw (Yagi for Windows) 2.6.10 John Drew VK5DJ DL6WU long boom Yagi creation no file import.yag (YO).maa (MMANA-GAL) Free 2.0 Kok Chen W7AY -.nec? Free (Mac OS-X version of NEC) -? -.nec.nec $39.95 Note: K6STI's AO and YO software no longer available. WB0DGF Antenna Site - Antenna Modeling Links The W8IO / WB0DGF Antenna Site (30 March 2015) NEC Software for Yagi Design Software / Version / Author Type of Yagi Design Input/Open/Import File Formats Save/Export File Formats Price version 5.8.14 Arie Voors -.nec.ez (EZNEC).ant (AO).nec.txt Free version 5 Roy Lewallen W7EL -.ez (EZNEC).en.ez EZNEC v.