If you carefully look under the 3D antenna, you can see there are pre-soldered areas that look like for receiving an U.FL connector. Quite challenging to access to though. Maybe desolder the 3D antenna first. [image: 1712063033613-m5core2antenna-resized.jpeg] [image: 1712062993748-screenshot-2024-04-02-at-15.01.58-resized.png]