This is what is needed to make a PC into a dd-wrt router...

Wistron CM9 RoHS 2.4/5Ghz 802.11A+B+G

Features:

High speed 11 Mbps (802.11b), 54 Mbps (802.11a/g) or 108Mbps (802.11a/g turbo) data rateWi-Fi, WPA certificated interoperability

Multi band operation with single card

Super G and Super A supportedWide frequency use possible

High Radio output power

Hardware AES-CCM EncryptionStandard U.FL coaxial connector type

WiFi chips made by world leader in Wifi AtherosHigh receiver sensitivity (-95dBm) for long distance operation

Specifications

Main Chipset: MAC: Atheros AR5213; PHY: Atheros AR5112

IEEE Standard Compliance

IEEE 802.11a 5GHz OFDM

IEEE 802.11b 2.4GHz OFDM

IEEE 802.11g 2.4GHz CCK

Frequency Range 802.11a: 4.9GHz ~ 6,1 GHz

802.11b/g: 2.3GHz ~ 2.5GHz

Receive Sensitivity: 802.11b: 95dBm @ 1Mbps 90dBm @ 11Mbps

802.11g: 90dBm @ 6Mbps 74dBm @ 54Mbps

802.11a: 88dBm @ 6Mbps 71dBm 54Mbps

Output Power: 802.11b: 18 dBm

802.11g: 18 dBm @ 6Mbps, 15 dBm @ 54Mbps

802.11a: 17 dBm @ 6Mbps, 13 dBm @ 54Mbps

Transfer Data Rate:

802.11b: 11, 5.5, 2, 1 Mbps, auto-fallback

802.11g (Normal mode): 54, 48, 36, 24, 18, 12, 9, 6 Mbps, auto-fallback

802.11g (Turbo mode): 108,96,72,48,36,24,18,12 Mbps, auto-fallback

802.11a (Normal mode): 54, 48, 36, 24, 18, 12, 9, 6 Mbps, auto-fallback

802.11a (Turbo mode): 108, 96, 72 48, 36, 24, 18, 12 Mbps, auto fallback

Operation Voltage: 3.3V +/- 5% DC

2 U.fl Ultra-miniature coaxial connectors on MiniPCI card

Environmental Specification

Specification operation temperature: 0ºC ~ 70ºC

Storage Temperature: -20ºC ~ 80ºC

Operating Humidity: 10%~90% (Non-condensation)