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This is mostly a curiosity question to people who know more about radio and wi-fi than I.

The 2.4Ghz band is massively overpopulated near my house to the point of sometimes getting >1000ms pings to the router from only a few feet away. inSSIDer finds at least 10 broadcasting SSID's within around 15 seconds of starting, so this isn't a real surprise to me! Sometimes I can get good results by changing the channel to something like 3 or 8, but it's usually temporary as the others use Auto Channel and hop around.

Now, the router I have is capable of 5.0Ghz, as is the laptop I type this on. Switching to 5.0Ghz gives superb results: I can download at ~90Mbps and get consistent 1ms pings. The problem is that only this laptop supports 5.0Ghz!

My question: Would I still get decent 5.0Ghz performance if I place a 2.4Ghz access point directly next to my router? And, indeed, will 2.4Ghz continue working as 'normal'? Testing would be an obvious step, but I threw all my superfluous equipment out in a recent house move.

My understanding is that I should get good performance, certainly in comparison to having two devices using the same frequency range, but I do believe there will be some impact by the virtue of them being directly next to each other.

(Cabling is not an option due to it being a rented house)

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Are you saying that your wireless router is only 5 GHz capable? If you are getting 90Mbps then you apparently have an 802.11n wireless router. Are you sure that it is not capable of dual-band (simultaneous 2.4 and 5 GHz) operation? –  sawdust Jun 9 '12 at 22:16
    
@sawdust I can switch between 2.4Ghz and 5.0Ghz (Wireless N, correct) but I don't seem to be able to get both to broadcast at the same time. You're right though, that would be the ideal solution. –  Dan Jun 10 '12 at 12:12
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2.4 and 5 are very far in radio spectrum from each other, they will not meet in air :)

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