Wireless-G Repeater.

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I want one, I've no idea which is the best. Anyone that has experience with them, please push suggestions/links in my face.

That was me, but the second router is being a bitch and won't work. My mum's company gave them to all their employees and apparently only a handful of them got them to work.

I looked into it a while ago, and I was surprised to learn that they like to play with same-brand access points (like the one in your wireless router). So, the best one to get is the one that's made by the company that made your router.I think you can get a passive repeater as well, which effectively reflects the signal around a corner...no power, no electronics involved. If you want to send the signal a long distance, then that clearly won't help.