Can I use the airport card in my macro to extend a network?

I've looked into extending a wireless network using an airport express, etc, but I was wondering if I could use an airport card in my Mac Pro to do this as well?
I realize I should be able to 'share' as a hotspot, but would prefer to extend an existing (or new) network instead.
cable modem----> airport or TC -----> Ethernet ----> Mac Pro -----> internal airport card (extends wifi network on airport or TC)
Thanks,

System Preferences > Sharing > Internet Sharing ...
can allow you to declare that your Mac Pro now includes simple Router functions that offers WiFi service to nearby devices. It has some limitations, but DOES offer DHCP to those devices.
When configured in this fashion, the Address assigned to the port on your Mac Pro is not a meaningful indicator of whether it is working properly -- that will be a self-assigned IP address in the range 169.254.xxx.yyy. The important address is the one provided to the WiFi devices, which is often 192.168.1.1.
Only the base channels 1 to 11 will be offered. Only WEP encrytion is offered. So if you already have lots of nearby Routers, this option is not that helpful.

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Can I use the airport card in my macro to extend a network?

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