Quote:
Originally Posted by Qiaozhi
It's difficult to see clearly from the photo, but it looks suspiciously like the two long antennas are able to swing back and forth. In other words (and confirmed by Geo) it appears to be a [rather expensive] dowsing contraption. Every LRL enthusiast should get one. 
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Here you can find a similar.....
http://www.longrangelocators.com/for...4&postcount=22
There is a generator with a 555 and the Rx antenna(s) is rotated on a bearing. Very simple....