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microphone - Really weird DIY shotgun mic (old, yes, but I just found it again...) - Sound Design Stack Exchange
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Eavesdrop from a Distance with This DIY Parabolic "Spy" Microphone « Hacks, Mods & Circuitry :: Gadget Hacks
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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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