Hi there Just purchased a new Airport express unit and have a query over setup. I realise it supports a/b/g/n networks at both 2.4 & 5 Ghz, but unlike the time capsule and airport extreme does not work in both frequencies at the same time. So my question - I have the radio mode selected as 802.11n (b/g compatible) - what frequency is it transmitting on when I select this - 2.4 or 5 ghz?? The devices that connect wirlessly to the express are an iMac (recent model), iPad & iphone 4. Any assistance greatly appreciated.