You'll need to follow this IFIXIT guide: [guide|10760|MacBook Pro 15" Unibody Mid 2012 Display Replacement]. Once you get the display assembly off you'll need to slide the clutch cover off and there you'll find the antenna board.
-
The part you want is this: [http://www.powerbookmedic.com/MacBook-and-MacBook-Pro-Unibody-Airport-Antenna-p-18060.html|MacBook Pro Unibody Airport Antenna Apple P/N 922-8782]
+
The part you want is this: [https://www.thebookyard.com/product.php?products_id=9343|15” Macbook Pro Antenna assembly, Apple P/N 661-5847]
You'll need to follow this IFIXIT guide: [guide|10760|MacBook Pro 15" Unibody Mid 2012 Display Replacement]. Once you get the display assembly off you'll need to slide the clutch cover off and there you'll find the antenna board.
The part you want is this: [http://www.powerbookmedic.com/MacBook-and-MacBook-Pro-Unibody-Airport-Antenna-p-18060.html|MacBook Pro Unibody Airport Antenna Apple P/N 922-8782]