Oh, I forgot their might be some other purpose for AWAC-type mapping of an urban area. Although it's not too well known, McDonalds and other fast-food franchises actually have state-monitored radio-frequency 'beacons'. These beacons transmit at a special frequency that the brains of schizophrenics are very sensitive to, and that draws schizophrenics like flies. And if you've seen an inner-city McDonalds full of homeless and assorted schizos, its either because their transmitter has drifted out of spec, or they've deliberated boosted it up to increase sales. So one purpose of those AWACs is obviously to map the fields of such transmitters. And its not the licensed ones they're worried about...imagine some 'terrorist' or other troublemaker getting one of those things and then cranking it up near some big political meeting, like G4 or whatever. (It's apparently happened on several occasions...apparently Woodstock was actually a pre-cmmmercial military test of the thing.) Anyone know the frequency of that device? I think it it's the megahertz region, but don't quote me. -TD _________________________________________________________________ MSN 8 with e-mail virus protection service: 2 months FREE* http://join.msn.com/?page=features/virus