Range extenders" are just the wireless part of the router, without any routing functions. Some, but not all, routers have repeater modes, often called WDS. That will work too.
DD-WRT definitely has that mode. There are several third party routers that can do WDS or client mode (act live a PC receiving the wireless signal with ICS) that puts out the network on the ethernet ports: http://www.ovislink.ca/WL354AP/WL354AP.h... plus others... You have to just shop around and find what you need....
One extends the range of the router the other offers more functions. Don't forget that a Range Extender lets you boost the signal in certain places only. First try to build a better antenna then buy.
http://lifehacker.com/296367/boost-your-...
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