https://makezine.com/projects/squirrel-baffle-spy-microphone/
Squirrel-Baffle Spy Parabolic Microphone | Make:
Jul 30, 2015 - Parabolic microphones gather and focus sound waves the way a satellite dish focuses radio waves, making it possible to hear sounds hundreds of feet away.
squirrel baffleparabolic microphonespymake
https://makezine.com/article/home/fun-games/weekend-project-parabolic-microphone/
Weekend Project: Parabolic Microphone - Make:
Apr 20, 2015 - Here's a an easy to make, dollar store DIY spy microphone that lets you listen from afar and bring the sounds up close. Credit for the original project goes to...
weekend projectparabolic microphonemake
https://en.wikipedia.org/wiki/Parabolic_microphone
Parabolic microphone - Wikipedia
parabolic microphonewikipedia