Hi
I have had one other reply off list which pointed at this link which
has a few figures on it.

http://www.wi-fiplanet.com/tutorials/article.php/1431101

Something I was mulling over was if you were in a housing terrace and
using a directional antenna you picked up a signal of an AP with a
default ESSID through the wall, could you look up the normal power
output from that AP, compare it with the power level you are receiving
and roughly estimate how many houses away the AP is.

I assume that the figures are too rough and that there is too much
that could be in the way and so affecting signal for this to work but
has anyone had this technique or similar work for them?

Robin

On 10/2/07, Raul Siles <raul.siles (at) gmail (dot) com [email concealed]> wrote:
> Hi Robin,
> You know very well these are just estimate numbers. Find below some
> signal loss numbers for obstacles I've collected from different
> sources along time. First column is the type of object. Second column
> is the loss (in dB's):
>
> Connector: 2-3
> Glass window (car, office¡­): 3
> Glass Window (metallic tint): 5-8
> Wall (drywall): 5-8
> Wall (wood): ¡Ö10
> Wall/Floor/Ceiling (concrete): 15-20 (¡Ö15cm)
> Wall/Floor/Ceiling (concrete): 20-25 (¡Ö30cm)
>
> You also have a reference table in the Wi-Foo book:
> http://safari.oreilly.com/0321202171/app05
>
> Another reference table is available here (page 4 of 5):
> http://www.avalanwireless.com/assets_v3/design_docs/AvaLAN_IndoorPathLos
s.pdf
>
> If someone has other references, I'd love to get and contrast them.
>
> I hope these are useful to you!
> Cheers,
> --
> Raul Siles
> GSE
> www.raulsiles.com
>
> "Security 617: Assessing and Securing Wireless Networks". Raul Siles.
> 26 November - 1 December 2007. London, UK.
> http://www.sans.org/london07/description.php?tid=343
>
>
> On 10/2/07, Robin Wood <dninja (at) gmail (dot) com [email concealed]> wrote:
> > Hi
> > I've just watched Pilgrim's defcon talk about being a wifi ninja and
> > in it he mentioned that trees block wifi signal by x db and brick
> > walls by y db. I know that it would be very approximate but I was
> > wondering if there was a list of these rough figures.
> >
> > Robin
> >
>

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