You'll notice that if you try to login to the administrative web GUI for your Netgear Cox router there is not a tab that lets you uncheck "Enable Wireless Radio". You have to use a hidden settings page on the router to disable this setting. The URL for the page is as follows:
http://##ROUTERADDRESS##/Rg802dot11BasicCfg.asp
use the IP address of your router where it says ##ROUTERADDRESS##. This might look something like this:
http://192.168.0.1/Rg802dot11BasicCfg.asp
On this page you will see a check box checked for "Enable Wireless Radio." Uncheck this box and hit APPLY below and your wireless will be disabled on this router and you are free to use a 3rd party wireless router of your choosing such as a ASUS RT-N66U Dual-Band Wireless-N900 Gigabit Router.
NOTE: Unchecking the "Enable SSID Broadcast" does not disable the WIFI. It only prevents the SSID from being broadcasted.