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tangor - 11:43 pm on Mar 26, 2010 (gmt 0)
Sniffers have been around for a while, there are rumors the spooks have some good to 300 feet, but those have been rather expense in the past. This kit and schematics for $100 means the kid next door might build one like we (older guys) used to do with Erector Sets or Heathkit gear. Because we could.