Increasing Range in WRT310N

I've been using the WRT310N and noticed that the range is quite poor--I've noticed this in two different houses.
Any suggestions for improving the range? How about changing the advanced settings? What to change them to? 
I've tried using an old repeater but it is a G repeater so it seems to actually make things worse i.e. a remote device will work slightly better with an unrepeated N signal than a repeated G (router is a in mixed mode).
I've currently got the router set to the 40 MHz radio band.
Thanks for any help.

Seems as if they have labeled those fields pretty confusing on the v1 router. Make sure you have the latest firmware...
The WRT310N uses only the 2.4 GHz band. There are 11-13 channels on that band with different frequencies.
20 MHz is the standard width of a single channel.
In 40 MHz mode it uses two channels at the same time: the standard channel and the additional wide channel.
However, as I wrote before, 40 MHz, i.e. two channels occupy pretty much 2/3 of the total 2.4 GHz band (only channels 1, 6 and 11 don't overlap). This means you get a lot of interference with 40 MHz bandwidth in places where you have a lot of other access points.
Try 20 MHz with different standard channels or use try "Auto". See if it makes a difference.

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