Overclockers Club published a review on the Diamond Dual-Band 2.4GHz/5.0GHz Wireless 802.11n Range Extender A quote from the article:

The indicators on the extender itself were really helpful in finding a good location to place it in the house. It was clear when plugged in that it was a bit out of range from the router and couldn't provide the best signal. It didn't take long to find a place where it sent out a strong signal and provided a much larger region of access. I used to have trouble connecting from the garage while working on projects; now it's not an issue. There are a few cheaper dual-band wireless extenders on the market, but quite frankly, I feel there are far fewer simple plug-and-play setups as this. The Diamond Dual-Band Wireless Extender is definitely worth your time if you are trying to get your signal further.

 Diamond Dual-Band 2.4GHz/5.0GHz Wireless 802.11n Range Extender Review @ OCC