The new Raspberry Pi 5 again lacks an SMA connector for the WiFi antenna. In Raspberry Pi 4, when using an aluminum case with cooling, the signal dropped significantly.
Again you will probably have to scratch the board.
I also wish there was an SMA connector on the Raspberry Pi 5, unfortunately, there is not.
This image:
Is again how it is on the Pi 5, with no easy location to solder the SMA connector to, the jumper resistor is 'broken out' to what looks like a test pad and that is about it.
An underrated blog post 
Deserving of re-posting in the blogs area of the Raspberry Pi group as "how to mod an antenna onto the Raspberry Pi 4 and 5"
