I read something about this a few weeks ago. I believe it was Aviation Week. I'll see if I can dredge up the details...
As I recall (and I'm doing this from memory), there was a problem with UWB and avionics. What caught my attention was that it seemed to be localized on the flight deck. This is to say, that it wasn't so much a problem with an antenna on the fuselage being mucked with as it was direct interference with electronics in the front of the airplane. The reason this stuck in my head was that the article suggested that the only way to protect the flight deck from interference generated in the cabin would be to shield all windows and cabin doors--this because UWB radiation was apparently leaving the cabin via these routes, reflecting off of other, external parts of the airframe, and entering the flight deck from the outside. I'm no electrical engineer, but my first thought was that it might be easier to shield the flight deck than the cabin, but hey, what the heck do I know...
If I find the article I'll check my story. Of course, I welcome correction from those more knowledgeable than myself in this area.
Dave