Printable antennas suck electricity out of thin air

There's energy flowing around you all the time. And not in some spiritual, holistic sense: wireless energy from cellphone networks, routers, radios, TV transmitters, and even satellites is saturating the EM spectrum 24/7. If you're clever, you can tap in to some of this energy with printed antennas and use it to power battery-free electronics.

http://dvice.com/archives/2011/07/printable-anten.php

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