On 5/21/18 6:03 AM, Paul Koning via cctalk wrote: > Another old CAD program is NEC2, the antenna (etc.) simulator. I forgot to post about it here, but NASTRAN is available on github along with a lot of other NASA code. https://github.com/nasa/ It is unlikely that the sources ever made it out from the CAD companies that gobbled each other up in the 70's to 90's