Replace the adhesive on the upper 5G mmWave antenna before reinstalling it. If you don't have replacement adhesive, reuse your old one or use custom-cut adhesive.

Remove the existing adhesive from the antenna with blunt nose tweezers or your fingers.

Remove the clear liner from your new adhesive.

Apply the new adhesive to the bottom of the antenna, with its round end farthest from the connector.

Remove the green liner from the adhesive before reinstalling the antenna in the frame.