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A fascinating site with downloadable info on vintage radios, based in the U.K.

A well-established antenna analysis program

A site featuring a simplified-interface Windows version of NEC2

U. K. Microwave Group - software and links page

A concise listing of computer-aided engineering links

A site with an emphasis on VHF, power amplifiers and Russian tubes

Cebik's antenna information saved by Igor, VA3ZNW