Heat up the edge. Focus on the bottom. Use plastic or poker card to open the Back Cover. Remove three screws here. Loosen the plastic bracket. Release the Battery flex cable. Now remove the broken Antenna. Mind the space here. This side should be connect to the bottom. Connect the cable. Put back the bracket. Tighten up the screws. Connect the Battery flex cable. Put on the Back Cover Sticker. Make the sticker adhere to the Back Cover. Remove the protective film. Install the Back Cover. Make it match well to the phone.