Why use 802.11 n/a?

[Princeton-Phil]

My router has two wireless bands:  802.11n/a and 802.11n/g/b. All of my clients are either "g" or "n". Is there any reason not to disable the 802.11n/a radio?

[Jotin]

It really would not matter which one you choose if you dong have an adapter with the A band supported. 

[Princeton-Phil]

Thanks for the quick response.

[buddee]

If you plan on using range links, use the 2.4Ghz side, if you plan on using close links, the 5Ghz side would be better, 5Ghz has no range and was more designed for congested apartment style setups where the 2.4 band is overused.

[Princeton-Phil]

Thanks for your advice. However, unless I am misreading the specifications on my new 

AirStation™ Nfiniti™ Wireless-N Dual Band High Power Router & Access Point WZR-HP-AG300H, I think it's always using both 2.4 and 5 GHz bands. Is this right?

[buddee]

Yes correct, it has dual radios, 1 radio for the 2.4Ghz band and 1 radio for the 5Ghz band. If you leave both of them on, then yes, its always using 2 radios/bands.

[y2kdad]

I have the same router. Which radio is for 2.4GHZ and which one is for 5Ghz?

Thanks