Making and Testing a Homemade Parabolic Mic - YouTube
Squirrel-Baffle Spy Parabolic Microphone | Make:
How to build a parabolic microphone dish - Videomaker
Dollar Store Parabolic Mic : 9 Steps (with Pictures) - Instructables
Long distance listening - this is a true parabolic microphone tried and tested. I can hear a light whisper at 50 yards animals scratching at 70 yards. : r/3Dprinting