The first thing that comes to mind when I hear vehicle mounted yagi is "foxhunt" or direction finding. You would use this to find the location of a transmitter. This would have some LE applications, as well as SAR. This could also be used to locate, say a downed weather balloon or something of the sort(though I'm sure if their equipment is that important to them they would incorporate GPS into it, but you get the point).
As far as the band goes, to make an educated guess one would use the length of the "driven element", or the one that's actually connected to the feedline.
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Driven element is assuming it's a yagi, as opposed to log periodic, which is a slightly more complex design where the length of all the elements is a log(remember trig class) function. Hence the name. But I digress.
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Last edited by j0nnyb1aze; 03-19-2009 at 06:30 PM..
Reason: Clarification.
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