Well first of all I would check what wifi card it is. If it is a 3x3 then better leave well alone. If however you have a 6205N equivalent or any 802.11n card that only requires 2 antenna wires, then the extra wire round the display frame is just that - extraneous. See my earlier post from January. In the case of that x220, it had the extra wire which was not connected to anything in any case - I removed it off from the screen entirely, but more importantly you need to make room on top for the webcam. That x220 is working brilliantly well and my son has no issue webcamming etc and there is certainly no loss of range.
I ended up returning the x230 and since it was <30 days out, they reordered me a new one with the webcam built in. I suspect that the 3 wire wifi card I originally had would have made the webcam a deal-breaker. Now that I have the webcam and "lesser" antenna config, I am happy with both wifi signal still and with skype-ability.
Thanks for the help!