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Despite all the advances of wireless 802.11n, walls and distance still conspire to kill your router's reception dead. Asus, like a knight of old, is here to rescue you like some long-haired damsel in distress.
The Asus USB-N53 dual-band 300Mbps wireless N adaptor performs very well, and goes some way to justify its higher than average price. Being dual-band, you get both 2.4GHz and 5GHz bands - as long as you have a capable router - and interference from other wireless signals is kept to a minimum.