Thanks.
But, you also have to have Airport Extreme Card installed in
your computers. So, if your Macs did not come with them,
remember to purchase them.
An Airport Extreme card is not required to use an AE or Airport Extreme Base Station. Both base stations are compatible with the 802.11b wireless standard.
Achieving data rates of 54 Mbps (802.11g wireless standard) requires that all users have an AirPort Extreme or Wi-Fi-certified 802.11g enabled computer and connect to an AirPort Express Base Station or Airport Extreme Base Station. If a user of a Wi-Fi-certified 802.11b product joins the network, that user will get up to 11 Mbps and AirPort Extreme and Wi-Fi-certified 802.11g users will get less than 54 Mbps. Actual speed will vary based on range, connection rate, site conditions, size of network, and other factors.
The 54 Mbps and 11 Mbps is related to wireless data transfer rates between computers only and you don't need an Airport Extreme card to play iTunes music wirelessly thru AirTunes and all Macs that are Airport ready without an Airport card installed don't support an Airport Extreme card.