Antenna types

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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