Homebrew radios made by prisoners of WAR

 "One recent project was building a replica of the “canteen radio” that was used by US Army personnel in the Japanese POW camp at Cabanatuan in the Philippines during WWII.  Its layout follows a description and drawing published in  Reference (5): US Army in WWII, The Technical Services, The Signal Corps: The Outcome pp 274-275; Below:  (Please excuse the cut-n-paste job!)"

http://www.n6cc.com/canteen-radio-receiver/

http://www.wftw.nl/203%20PoW%20radio%201%20canteen%20v1%2000.pdf

http://www.skywaves.ar88.net/SPY/spy.htm

https://hackaday.com/2016/04/21/hacking-when-it-counts-pow-canteen-radios/

https://news.justcollecting.com/the-secret-pow-camp-radio-that-inspired-a-hollywood-classic/

https://www.bbc.co.uk/history/ww2peopleswar/stories/70/a4127870.shtml

https://www.awm.gov.au/collection/C1002932

https://commons.wikimedia.org/wiki/File:Foxhole_radio_from_WW2.jpg

https://worldradiohistory.com/Archive-Radio-Craft/1940s/Radio-Craft-1944-09.pdf

https://worldradiohistory.com/Archive-Modern-Electrics/Modern-Electrics-1909-01.pdf

http://www.lothiansradiosociety.com/lrs-archive/50-photographs-early-years/1160-1940s-tom-douglas-g3ba-pow-radio-man-in-siam-thailand

https://www.iwm.org.uk/collections/item/object/30005330

http://www.wftw.nl/207%20PoW%20radio%205%20tin%20can%20v1%2000.pdf

http://www.wftw.nl/212%20PoW%20radio%2010%20Changi%20Gaol%203%20v1%2000.pdf

https://www.n6cc.com/vietnam-radio-echoes/

https://the-wanderling.com/dancer.html

https://the-wanderling.com/spark_gap02.html

Many prisoners during the WW2 make homemade radios even the Germans or Japaneses can kill you for this.