How to build a parabolic microphone dish - Videomaker
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
Amazon.com : HSTD Parabolic Microphone Monocular, Sound Amplifier Spy Ear Bionic Listening Device, Long Range Listening Device up to 300 FT 8X Magnification for Birds Listening B : Electronics