If you want something on the cheap I had no problem with a TP-Link USB dongle. Double-check though because not all of them are atheros. http://www.amazon.com/TP-Link-TL-WN821N-300Mbps-Wireless-Adapter/dp/B002T4D3M2/ref=sr_1_9?ie=UTF8&qid=1345693995&sr=8-9&keywords=tp-link+wifi