Can't find interference robustness checkbox for airport extreme.
I have a set of wireless headphones (Sony) that constantly interfere with my iphone wifi on 2.4 frequency. I have both the 5.6 and 6.0 airport utilities on my Macbook Pro. When I go into Airport utility Wireless, I check all the options and can't find the Interrerence Robustness checkbox. I do see the use wide channels. What am I doing wrong?
MacBook Pro, Mac OS X (10.7.3)