> I'm not up on regulations, but if the restriction is on EIRP (as it 
> sounds) then  once you get to an antenna that requires you to reduce 
> your output you have nothing to gain by using a better antenna.
> 
> In other words I think this only makes sense if 1) you don't have 
> enough power though your standard antenna to reach the regulatory 
> limit, or 2) you don't actually intend to adhere strictly to the 
> regulation, or 3) you have some nearby interference which the 
> regulations don't prevent (like bluetooth, or a cordless phone).
> 
> I'm not an expert, but I hope you're not barking up the wrong tree here.

Well, I'm not an expert on wi, but I was told that focusing the output
by an antenna and lowering the power accordingly is good, because the
antenna shield you from nearby interference and others are shielded 
from yours.

Bye	Pavel