Thanks yoyellow and danymarc
The goals:
In my case the NEXX is a cheap little device that can turn a HDD into a NAS, but i wanted to keep if out of the wifi domain.
I also have in mind to disable the wifi from and other NAS box, just to be sure that there is no way to get it's data crippled by WiFi script kiddies etc. thus hacking the electronics if there isn't a wrt flash available for it.
And then i can be 100% sure that wifi will be turned on accidentally (or on purpose by someone for whatever reason) This way it is possible to build a reasonable cheap yet sufficient secure LAN (not connected to the web or outside world) even with a crap router if nothing else is available.
So depending on the situation the NEXX could be used in a LAN without new firmware. But yea, that doesn't make sense when you have OpenWRT.
So i'm still interested in info how to disable a wifi antenna with a soldering iron. :-)
On top of that there are ever more wifi devices clogging up the bandwidth, so why not disable a few that are just taking up space (and cooking our meat, hehe)
I've seen that some of the German Fritzboxes have an external button to toggle the wifi on or off. I think that would be a very nice feature to have in OpenWRT. Read out a GPIO pin and toggle wifi on and off on the GPIO signal.