I just got one. I opened it, which is easy. You lift the same end that you take the screws out of, just a little and then slide the back towards the same end you just took the screws out of and the back comes right off. The antenna connection is under the battery, so you disconnect the battery and it comes off the double sided take fairly easy, which is nice and then disconnect the antenna and there you are.
Volume control module and the ribbon cable. The black section on the receiver for the cable lifts and you can slide the cable out and then reseat it and push the black lever back down.
You can see where the antenna attaches in the upper left corner of the image.
Yeah I heard from Paul and fixed it already, it was very simple.'
At $1000 this is pretty unacceptable though straight out of the box. On top of that when I unscrewed the silver panel it sort of "slid" across the back plate and scratched it. I'm just left disappointed.