Clandestine radio stations 1 ?

 https://web.archive.org/web/20231123062655/https://icomjapan.blogspot.com/2023/06/0-to-30-mhz-what-can-we-hear-and-listen_14.html

https://web.archive.org/web/20080730143856/http://www.clandestineradio.com/

https://worldradiohistory.com/INTERNATIONAL/CQ%20Radioamateur%20France/CQ-Radioamateur-1996-05-No012.pdf

 https://www.dxing.com/clandest.htm

https://swling.com/blog/wp-content/uploads/2016/07/CIA%E2%80%99s-Clandestine-Radio-Broadcasts-Short.pdf

https://en.wikipedia.org/wiki/Soldatensender_Calais

https://nymas.org/radioproppaper.htm

https://web.archive.org/web/20080730143856/http://www.clandestineradio.com/

https://www.youtube.com/@jonny52107/videos

http://www.schoechi.de/pic-cla.html

In French

https://worldradiohistory.com/INTERNATIONAL/CQ%20Radioamateur%20France/CQ-Radioamateur-1996-05-No012.pdf

https://www.ciphermachinesandcryptology.com/index.htm

https://f5oih.wordpress.com/2020/04/26/lecoute-en-mode-ale/

http://www.pateplumaradio.com/pateclan.html