>I do not see any reference to using 3 coils in their blurb and their antenna
>box looks very small and the system very cheap when you look at comparable
>products.

They don't actually say that, it's my presumption.

>If their product is that unique it must be "protected" by patents or
>marketing Bull***t has taken over from physics, maths and engineering.

It does work. There's one located in Kokomo IN, which displays reasonably
accurate plots in our area.
Unfortuntely, I can't get at that one mobile, and what I really need is
about a 20 mile radius.

--
Dave's Engineering Page: http://www.dvanhorn.org
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.