enlarge an already excisting non-apple ...

Hello

I'm trying to use a new AirPort Express to enlarge an already excisting wireless network.
This is a network of my neighbourg (we share an internet-connection). Because the signal is only strong in one corner of the room I try to enlarge his network.
The thing now is, that I don't know what wireless rooter he uses, but I'm quite sure it isn't an apple one.
An cable is not an option because we are not allowd to drill holls in the walls of our appartment so I only can reach this network wireless.
I can't figure out how I have to configurate my AE to enlarge his network.

Thanks

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