Here's a link to my new holiday-themed Supergirl fan fiction story, "The National City Holiday Spectacular". Hope you like it!
https://www.facebook.com/photo/?fbid=2242612529203434&set=a.114468392017869
And yes, the "foxhole radios" of WW II were real - I didn't make that up! In fact, history buffs can still buy kits to build a working replica of them. Here's one:
Here's the Hawaiian Christmas song that Kara plays in this story:
https://www.youtube.com/watch?v=RZXJTbyt5UM&t=13s