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I finally found the iPhone app I wanted to tell you about, WiFiFoFum. It will give you signal level readout updates very quickly, good enough for peaking on signals, this with a piece of metal behind your iphone to act as a reflector, perhaps a garbage can lid, should work fine, if you happen to have an iphone or ipad:
iOS | WiFiFoFum
The display can show signal levels two ways, in a list, or as a radar screen type of display with the strongest signals in the center. The latter display gives the impression of the unit being directional because the individual Wifi signal strength indicators are spread out on the screen in positions around the center, but in reality, there is absolutely no directionality to it, it is just the way the display has been programmed to show different wifi transmitters which are strong enough to pick up. Cool, none the less. I used this app on my phone when working on a base in Afghanistan to find wifi hot spots on the base, as you walk closer to them the signal goes towards the center of the radar scope, further or weaker, they go to the outer perimeter of the display.
What I don't know is if this will work to identify signals in the wifi band which are not transmitting as internet hot spots, routers or IP based communication links. IF this will not do so, you are better off with a spectrum analyzer. That, or something like this with a long boom directional WiFi Yagi or loop antenna, if it goes high enough in frequency, I think it might, but the photo is a bit blurry: http://www.ebay.com/itm/RELATIVE-SIGNAL-STRENGTH-METER-KIT-/121530256510 - Only problem with this is it will pick up ALL radio signals in a very wide swath of frequencies and because of that, might not work well for you if some local radio station keeps overpowering the 2.4 GHz signal you are sniffing for, if it has enough gain. A lot of If's....
iOS | WiFiFoFum
The display can show signal levels two ways, in a list, or as a radar screen type of display with the strongest signals in the center. The latter display gives the impression of the unit being directional because the individual Wifi signal strength indicators are spread out on the screen in positions around the center, but in reality, there is absolutely no directionality to it, it is just the way the display has been programmed to show different wifi transmitters which are strong enough to pick up. Cool, none the less. I used this app on my phone when working on a base in Afghanistan to find wifi hot spots on the base, as you walk closer to them the signal goes towards the center of the radar scope, further or weaker, they go to the outer perimeter of the display.
What I don't know is if this will work to identify signals in the wifi band which are not transmitting as internet hot spots, routers or IP based communication links. IF this will not do so, you are better off with a spectrum analyzer. That, or something like this with a long boom directional WiFi Yagi or loop antenna, if it goes high enough in frequency, I think it might, but the photo is a bit blurry: http://www.ebay.com/itm/RELATIVE-SIGNAL-STRENGTH-METER-KIT-/121530256510 - Only problem with this is it will pick up ALL radio signals in a very wide swath of frequencies and because of that, might not work well for you if some local radio station keeps overpowering the 2.4 GHz signal you are sniffing for, if it has enough gain. A lot of If's....
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