WHY am I facing problem with my "MOTO X WIFI ANTENNA"?

I recently happened replaced my broken l.c.d screen (Moto x)!! and ever since then no matter how close i am to the WIFI router, it hardly shows two bars of signal!!

if i even move a little away from the router, it drops down to one or less, like the images attached below... can any one help me locate the WIFI antenna on Motorola Moto x (2013), SO THAT I CAN GET IT REPLACED OR DETACH AND REATTACH IT.

PLEASE HELP ME OUT, I'll WILL BE GRATEFUL :-)