That's pretty dang cool! They're fun skill building exercises. We used to do similar stuff in Civil Air Patrol when I was a kid to simulate locating crashed aircraft.
What's that antenna called? I'd like to make one. I made my friends and I some simple ground plane antennas and it was a lot of fun. I feel like antenna making would be a really fun hobby all on its own.
For sure. We used to make field expedient antennas when I was in the service and it was an art form.
This is known as a TDOA, Time-Difference-Of-Arrival detector and is a kit available from:
https://www.handi-finder.com/
Thanks, I'll check them out! :)