Apple uses the name “AirPort Extreme” to refer to every version of 802.11g and draft-n compatible wireless card they have ever put into a computer. While some of these cards are supported, the level of support varies from card to card. You must be using at least r148 (look in KisMAC, About to find the revision number) for any support, and r239 if you are running OS 10.4.10. On the Intel machines that use Atheros chipsets (including the MacBook and MacBook Pro) the card cannot collect valid data or unique IVs as it attempts to decrypt packets in hardware with the wrong key. We don’t yet know if Broadcom cards in Intel machines (iMac, Mac Pro) suffer the same issue or not. PPC machines shouldn’t have this issue, though Broadcom cards are reported to have generally corrupt frames on any platform (they pass on corrupt frames that aren’t properly checksummed). No AirPort Extreme cards support injection.