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On Sat, 2010-05-01 at 08:35 +0100, Matthew Macdonald-Wallace wrote: > Quoting John Williams <subbass@xxxxxxxxxxxxxxx>: > > One of my jobs today, see if my wifi signal extends to the road. Trouble > > is I won't know if Google had some far more sensitive antenna in their > > cars :( > > I've had reliable 802.11b connections running over links up to 500 > meters if not more in length using modified pringles cans. > > Using 8dB omni-antennae, I can easily get a "doughnut" range of up to > 200 meters if not more - far more than you'd need to scan the width of > a street whilst you're driving down it. > My friend Bob informs me that it's entirely possible to scan an entire > street from the comfort of your car with nothing more than Kismet, > GPSd, a home-brew omni-antenna, a usb gps-dongle and a laptop (he's > said that even a P-II with 128M RAM would be enough for this!). > > > If Bob can find your network, then I'm sure Google can... I don't live on a street, I have a moderate distance of my own property between the road an my router. 80yds at an estimate. I don't imagine google had directional antenna sprouted in all directions, at a guess just larger/more sensitive general one/s. Most likely at the top of their camera assembly somewhere, it would be most logical? -- John Williams <subbass@xxxxxxxxxxxxxxx> -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html