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Which Alfa Card should I buy?


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Not really. Some of the newer alfa card aren't any better. They might have more watts but the chipsets aren't supported by Aircrack or Reaver if I'm not wrong.
I did however buy the AWUS036NHA, which has a Atheros chipset. It has 802.11n and supports 5 Ghz wifi. But there are disadvantages.
Some info I found on the net:

Disadvantages of 5GHz:
In general, the higher the frequency of a wireless signal, the shorter its range. Thus, 2.4GHz networks cover a substantially larger range than 5GHz wireless networks. In particular, the higher frequency wireless signals of 5GHz networks do not penetrate solid objects nearly as well as 2.4GHz signals, limiting their reach inside homes.

I have found that the AWUS036H is a "Better Card" when it comes to range. But when possible having the AWUS036NHA can be nifty.

I still use my AWUS036H, it's a damn good wifi Card :)

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