how long have apple been doing dual band ?

[L plate]

on the airport ?

 

[jeremyshaw]

on the airport ?

At least the 4th and 5th gen had them. IIRC, there was one called the "Dual Band" AirPort (like the "Fast Ethernet" and "Gigabit" ones in the past).

 

[BreakGuy]

In early 2009 Apple added dual-band capabilities to the AirPort Extreme and Time Capsule.

 

[rgarjr]

3rd gen AEBS started doing simultaneous dual band. 2nd gen had dual band.

 

[L plate]

thank u all

 

[Mikesus]

Have a 2nd gen TimeCapsule and its Simultaneous dual band. (at least it appears that way)

 

[waw74]

http://en.wikipedia.org/wiki/AirPort_Extreme_802.11n#Comparison_Chart

the second gen is dual band not simultaneous dual band.