Adding an external antenna to Raspberry Pi 5 (Raspberry Pi 3 and 4 included)

An external Wi-Fi and Bluetooth antenna adds an entirely new dimension to Raspberry Pi, especially when diagnosing wireless Wi-Fi and Bluetooth networks with Kali Linux. Raspberry Pi 4 and 5 both have the same Wi-Fi and Bluetooth module implementation thus the same procedure may be used. Mounting an external antenna in Raspberry Pi 3 is even easier. The Wi-Fi and Bluetooth module on Raspberry Pi 4 and 5 is located at the upper left corner on the top side of the board, next to a 40-pin extension port. Though it is not immediately clear how the external antenna should be implemented, looking at Raspberry Pi compute module 4 printed circuit board with a similar Wi-Fi and Bluetooth module placement reveals an easy solution. The antenna output line is connected to a small antenna multiplexer chip that can either select internal or external antenna. The external antenna must be connected to a small female connector on the printed circuit board. Raspberry Pi 4 and 5 don&t have this switch, neither they have a female antenna connector, but latter may be added and firmly connected to the Wi-Fi and Bluetooth module antenna signal line. If observed closely through a microscope or a magnifying glass, a small curved antenna signal line can be seen exiting the module metal shielding. The line is directly connected to a printed circuit board antenna consisting of four small surface mounted elements, which are arranged in two series of two elements. There is also a mysterious contact on...