Airport extreme: no external antenna?

[Jim Witte]

> .. place in the wireless router market, i doubt Apple itself could  
> harm the antenna niche
> (that said, i'm happy i have a garage-sale Dr. Bott directional  
> antenna on my 802.11g Apple router)

Does anyone know what the specs for an external antenna for 802.11n  
would be?  Is it just 2 (or 3) hooked up, or are there requirements  
or spacing, length, special filtering of signals between them, etc?

   As for the external-antenna niche market, I bet if it's  
technically possibly and feasible (meaning marketable), someone will  
figure out how to make a bigger and/or stronger MIMO antenna (or  
perhaps one with 4 antennas in a line, not just 2; or 3 that are  
mutually perpendicular in a cube), that will then hook onto the AE  
somehow - even it it means sticking small transmitters to the side of  
the box and putting the whole thing in a Faraday cage.. (They could  
call it the Jar Antenna Extender.. :) )

Jim