As some of you are having storms, here's a link from a while back.
Quote:
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The Boltek PCI StormTracker works by detecting the radio signals produced by lightning. These are the same signals you can hear on an AM radio during a thunderstorm. The Boltek PCI StormTracker's direction-finding antenna provides direction information while storm distance is calculated from received signal strength. Special processing in software reduces the effects of strike-to-strike energy variations providing more accurate distance information.
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http://www.isleofwightweather.co.uk/live_storm_data.htm