wrote in message
news:c2Fnb2JvZw==.df7dc74f4bf770412c274c3f1a0d5a90 @1085498663.nulluser.com...
Boltek makes a very nice lightning detector system
http://www.boltek.com/stracker.htm displaying both bearing and distance
of lightning strikes. I understand how you can do this with a couple of
nice crossed loops but the antenna for this system is a little plastic
black box 3" high by 2" by 1-1/2" connected to the main unit with Cat
5. Does anyone know, or care to guess, what's in the box?

well, the direction could be by a small pair of crossed loops, plus a
polarity sensing element to remove the directional ambiguity. add a small
flux sensing element to determine the orientation of the sensor and there
you can get a magnetic bearing. the polarity sensing element can also
generate a peak amplitude signal which can be used to make a very rough
estimate of distance. add a couple digitizers and a fancy map program and
you have it made.