The system, named Ngara (pictured above), works by installing antennas on existing TV broadcasting towers that transmit wireless broadband to households through their existing TV antennas, although slightly modified as some components in existing antennas do not allow them to be used as transmitters.
参考:http://www.zdnet.co.uk/news/networking/2010/12/17/researchers-test-wi-fi-via-tv-antennas-40091205/
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