To fully maximise your Xiaopan OS experience, the card you have or the one you will get needs to be compatible with: a) aircrack-ng b) Xiaopan OS c) Reaver d) compat-wireless Therefore, it is a good idea to get an all rounder card that can do everything. Bear in mind that Minidwep and FeedingBottle both use aircrack-ng! According to the aircrack-ng wiki the best cards (check out the wiki for specific cards) to use are: Atheros Chipsets One of the best chipsets nowadays is Atheros. It is very well supported under Linux, and also under Windows. The latest madwifi-ng patch makes it possible to inject raw 802.11 packets in either in Managed and Monitor mode at arbitrary b/g speeds. The madwifi-ng compatability list is an excellent way to determine if a card is compatible with the aircrack-ng suite. Atheros, the chipset manufacturer, also has a web page that enables you to lookup chipsets for products incorporating their designs. The madwifi-ng driver is used for the atheros chipsets. This driver does not support any USB atheros devices. However, Atheros acquired Zydas which makes USB chipsets (zd1211 and zd1211b). Atheros has renamed this chipset to AR5007UG. The AR5007UG chipset is NOT supported by the madwifi-ng driver, but it is recommended, because its one of the cheapest chips (about 5, 6$ on eBay) supported by aircrack-ng and offers reliable and stable operation for wireless connectivity. Starting with 2.6.24, AR5007UG(zd1211/zd1211b) can be used with zd1211rw. Another USB chipset, AR9170, which covers Atheros and Zydas chipsets (zd1221) also provides aircrack-ng support with a mac80211 driver called carl9170. So does the ath9_htc for USB chips: AR9271 and AR7010. As of kernel 2.6.26 and later, a new driver has been incorporated named as ath5k. This driver, unlike the madwifi-ng driver which requires HAL and was previously proprietary is a HAL-free based driver. Most popular linux distributions would already have this driver included which should provide support for those using such chipsets and preferrably to try injection patches on this driver before reverting back to the madwifi-ng. Also, with ath5k comes ath9k, introduced for Atheros 802.11n capable chipsets. The ath5k and ath9k are not compatible as they have different designs. For more information refer to this page. It contains updated information on upcoming support for other atheros chipsets (except for atheros MIMO). Ralink Chipset Comments Ralink makes some nice b/g chipsets, and has been very cooperative with the open-source community to release GPL drivers. Packet injection is now fully supported under Linux on PCI/CardBus RT2500 cards, and also works on USB RT2570 devices. However, these cards are very temperamental, hard to get working, and have a tendency to work for a while then stop working for no reason. Furthermore, the RT2570 driver (such as that for the chipset inside the Linksys WUSB54Gv4) is currently unusable on big endian systems, such as the PowerPC. Cards with Ralink chipsets should not be your first choice. There is one exception with regards to the Ralink chipsets. This is the RT73 chipset. There are excellent drivers with high injection rates for the RT73 chipset. Devices with the RT73 chipsets are recommended. As of kernels >= 2.6.26 there are mac80211 based drivers which should give better support for almost all Ralink chipsets. As for Ralink 802.11n capable devices, they are slowly gaining support, read here. Realtek RTL8187L Chipsets Cards containing the Realtek RTL8187L chipset work quite well and is recommended. The driver patch for this chipset has been continuously improved and quite good at this point in time. The Alfa AWUS036H is a very popular card with this chipset and it performs well the aircrack-ng suite. This chipset is not to be confused with the RTL8187B, which is nowhere near as tested as RTL8187L.