Dual bands means using two different RF frequency bands
You can use two different RF frequency bands in 802.11N: 2.4GHz or 5GHz. The first Wi-fi specs, 802.11a, used 5GHz and if you only need short range it performs GREAT. The trouble with 5GHz is its range is quite pathetic. The subsequent 802.11b and 802.11G use the 2.4GHz, which offers better range but also its fair share of drawbacks: it only offers 3 independent channels effectively and more importantly the 2.4GHz is over-crowded (cordless phones, microwave ovens and bluetooth all operate on that spectrum so can easily result in interference). 802.11N allows you to use the 5GHz whenever it's possible, otherwise it'll switch to the 2.4GHz band.
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