I would advise you <against> placing the antenna inside the building 
behind the window. Not only may the RF wave suffer distortion, but more 
importantly, RF energy can be radiated back into the room. Remember: 
your AP operates at microwave frequencies. You must keep your exposure 
to microwaves to a minimum.

To be certain that you will have adequate throughput, you must have 
adequate signal strength at both sites. At 2400 Mhz (802.11b), line of 
sight is ideal and path loss would be your only obstacle. Buildings are 
opaque at microwave frequencies.

Neal

On Dec 16, 2003, at 6:35 PM, Chris Scheidecker wrote:

> How far will a 14dbi directional antenna reach?
>
> We're trying to get users at location B to connect to a base station at
> location A reliably.  Location A is one block from location B.  The 
> access
> point (and the antenna) would be located in a window on the third 
> floor of
> location or on the roof (still just over the third floor) of location 
> A.
> Tough part is, location B is on the back side of a 3 - 4 story 
> building.
>
> Assuming the walls of the building are not made of lead, what are the 
> chances
> of a reliable connection?
>
> Is 14dbi overkill?  Underkill?
>


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