E3000 - 2.4 g range better than 5.0 n?

Just bought a E3000.  Other than not being able to disable the guest account in the web setup, I'm very pleased.  I have the 2.4 GHz channel pushing G-only with WEP security and the 5.0ghz channel pushing N-only with WPA2 Personal security (separate network names, etc).
When I log into a device that recognizes both networks, the 2.4 g network has much better range than n.  I was expecting the opposite.  Any ideas why, or how I can improve the n channel?
The good news is that the G range is massively better than my old g router, so I'm happy overall - but kind of disappointed with N.

The lower the frequency the higher the range. 5 GHz will in general have less range then the 2.4 GHz band. That's normal.

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