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Here’s an interesting piece of arty annoyanceware, a GPS jammer that finds your coordinates (via GPS) only after you find a place and stand still (switched by a motion sensor), then the device jams the waypoint for everybody else. The concept of the device is to help you find you a place of solitude and then its blots out the spot electronically, so that others can’t find it.

GPS-HOG – 2007 – Link

Related:

  • Modifying a cheap portable cellphone jammer – Link
  • The World’s Simplest Radio Jammer – Link
  • Wave Bubble – Open source Wi-Fi, cellphone, GPS and … – Link
  • Turn off TV week – Link

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Personal cell phone signal blocker device ($48 – not sure what’s up with this company, proceed with caution) – Link.
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Wavebubble open source RF jammer – Link.