I have done the same thing, it appears that my wi-fi is still functioning but the problem is the signal appears to be very weak and I cannot get a signal upstairs anymore.
I seen there was also a rubber stick pad covering the connection which I believed should be rooted to the frame of the digitizer. I took this pad off and it increased the signal but only slightly, I opened it up again and taped a speaker cable and routed the cable to stick out the side just and no more.
Looking into the workings of a wi-fi I antenna designs on other products such as laptops the cable antenna cable is routed all the ways around the LCD inside the frame.
There was a small shiny bit on the inside of the digitizer with a plastic peel off cover on it but it does not align with the connector part on the top of the antenna. I don't know if this was just a manufacturing defect.
My next thing to try is run a very thin speak cable consisting of 2/3 strands to run all the way round the case and connect as one big loop.
Also just to drop a bit sold on the damaged grounding pads.
Most of the above is just based on theory. I work as an engineer for a repair centre of mobile devices and am faced with issues like this quite a lot.
