Wireless Bridge connected to switch/hub if within the same network range or router with wireless client mode (can connect multiple network ranges)
But if you have the time, then as others have mentioned its better to reflash a router with custom firmware for more feature rich experience and maybe cheaper one too if you can get a compatible 2nd hand unit from ebay or have a spare around the house.
Check a list of custom firmware -
https://en.wikipedia.org/wiki/List_of_router_firmware_projects I think DD-Wrt would be easiest. I run OpenWrt since its lightweight but I mostly configure everything from the shell prompt, maybe not as user friendly.
You might want to investigate Powerline ethernet adapaters. I havent had any experience with them but it is another option.
http://thewirecutter.com/reviews/best-powerline-networking-kit/
