HOMEMADE SENSITIVE LISTENING DEVICE
This is a file that tells how Mike from Michigan built his very sensitive listening device .
Can you find a listening device in the picture??? Look closer –There is a clue in the second picture .
Once built this listening device was able to hear a low whisper at 1200 feet in open line of site — 600′ thru trees/brush. It can be built in almost no time at all .
Long Range Listening Device
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