| You would need a router that supports 802.11n, and your computer would have to support 802.11n.
"Upgrading" to 802.11n usually means buying new equipment that supports 802.11n or verifying that your equipment supports 802.11n -- there's really no other upgrade path. If you have an Intel Mac mini, then it probably supports 802.11n already. If it's a G4 Mac mini, then I don't know... if you can provide the exact model of Mac you're using and the exact model of router you're using, we can probably tell you if they support 802.11n.
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