Is it the bluetooth or airport antenna, or both, that is on the rear of the later model G5s and covered by a vertical strip of grey plastic? I've been looking at mods to fix the horrible bluetooth reception on my 2009 Mac Pro. It seems the best solution is to run a cable from the stock Apple bluetooth card to an externally mounted antenna. Most people are drilling a hole in a PCI slot cover and mounting the antenna there but that takes up a PCI-E slot. I'm wondering if there might be a way to conceal a rear mounted antenna using parts from a G5. Does anybody have a pic of a G5 with that plastic cover off? I don't know if its covering an indentation in the case where the antenna sits or if the antenna is thin enough that it could actually just be stuck on the back of a Mac Pro and covered with that plastic piece. I expect it would take some modification but it'd look better than a big router antenna sticking out of the back of the Mac Pro.