Using an iMac to extend a Wireless network I'm right on the edge of my WiFi range, but my iMac is hard-wired with Gigabit Ethernet. Is it possible to use my iMac's Wifi to extend the range of my wireless network to provide better connections to my mobile devices?

I know I can setup a separate network with my iMac, but it would be ideal to stay on a single network in various parts of the building.

I'm using a Late 2012 iMac.
Is this what you're looking for? WiFi Sharing

If so, you can create a network with the same SSID and password as your existing network