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Date: Sat, 21 Mar 2009 15:09:10 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Polytropon <freebsd@edvax.de>
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Cc: freebsd-questions@freebsd.org, Modulok <modulok@gmail.com>
Subject: Re: Creating a 10km wireless bridge...pointers?
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>>
>> LAN<->BSDrouter<->modem<->Antenna<~~air~~>Antenna<->modem<->DSL
>
> Your BSD router would act as a gateway, eventually using
> functions like "IPDIVERT and DHCPd via RF". It would then
> serve as an AP, put in simple words. This should be achievable
> mostly by means of the base OS.

Do not use builtin cards for such links unless you like to keep computer 
outside.

long RF cables=LARGE signal loss.

There are LOT of external radiobridges that are designed to be placed 
outside so it's connected to antenna almost directly.