Re: Antenna types

Hello,

These are your friend:

Free Space Loss =20Log10(Frequency in MHz) + 20Log10 (Distance in Miles) +
36.6

Rx Signal Level = Tx Power - Tx Cable Loss + Tx Antenna Gain - FSL + Rx
Antenna Gain - Rx Cable Loss

And dB is logarithmic. Increasing by 3 dB is doubling the power and
vice-versa.


On 4/30/07, Lucio Crusca <[email protected]> wrote:
>
> Hi everybody,
>
> I'm new here, I'm new to wardriving, I'm not even from Seattle (I'm from
> Italy). So please be patient with my newbie questions...
>
> I'd like to purchase some hardware to do wardriving (warwalking, etc...)
> this summer. I plan to buy a 2511CD+ext2, a 7dBi omni directional antenna
> and a directional antenna. For the omnidirectional I guess there isn't
> much
> to say, they are all more or less the same except for their power, right?
> The directional antenna is what puzzles me... which type should I buy?
> Bare
> cantenna? Yagi? Panel? Will a home built cantenna perform just like a
> bought one? Will a 20dBi yagi outperform a 15dBi cantenna by 33% longer
> range?
>
> TIA for any advice.
>
> Lucio.
>
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