Just wanted to add something I think might be useful to somebody.
I did this same thing a couple days ago. I thought I trashed my controller, but what I learned is if that little stem or pin sticking out of the board is intact, you can still attach your antenna cable connector back onto the board, and it should work fine provided you can get it to stick to the board somehow. The purpose of the ring that surrounds the stem/pin is to give the cable something to snap onto. So if that has been ripped off, soldering your antenna cable, (pigtail, whatever) will work. I've read this on some other post I found with google, and I also tried it myself. I did not lose any range at all. Point is, one doesn't necessarily need to buy a new board or new controller.
The trick to scraping off that white silicone stuff is infinite patience and the right scraping tool. Fifteen minutes is probably not enough time. An hour will produce better results. Don't try to pry anything UP before the stuff is scraped off.
Hope this helps somebody some day.
