This SMA connector is designed to fit into PCBs and provides a solid connecting point for an external antenna or other device. Normally this is used with a specific PCB footprint but it can be made to work with .100 / 2.54mm standard “breadboard pitch” prototype PCBs with a little creativity.

For those designing their own board, this part is compatible with the “SMA90_DIP” part in the Adafruit Eagle Library.