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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
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How to Build a Long Range Laser Spy System for Eavesdropping on Your Neighbors « Mad Science :: WonderHowTo
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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
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Insect Eavesdropper: Creating a High-Gain Parabolic Microphone : 6 Steps (with Pictures) - Instructables
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