If you have ever watched an NFL football game, you have probably noticed those giant parabolic microphones and how they work so well to absorb every sound that happens on the field.

Unfortunately for you or me, to buy these parabolic microphones is extremely expensive. The good news though, is you can quite easily make your own at home for next to nothing and they work unbelievably well.

Once you've got it built you could easily use this as a spy microphone as it will pick up the tiniest of sounds from very far away. Watch this simple video, and in less than 20 minutes you will have yourself one heck of a spy parabolic microphone.

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