How do I setup a wireless repeater bridge.

[Jigy]

I am using a D-Link DIR 600 atm.

[Oshino Shinobu]

There's a guide here for setting up a Repeater Bridge. It's for DD-WRT, but only the second (bridge) router needs to be running it. The first router simply needs to support a compatible encryption standard. WPA2-aes works, and is mostly standard on fairly recent routers. 

https://www.dd-wrt.com/wiki/index.php/Repeater_Bridge