How to increase

This (Smyka Bluetooth Dongle V.2) Bluetooth dongle can be easily modified to attach an external 2.4 GHz antenna to it and increase the range up to 1 km.

YT: Bluetooth USB Hacking, add an external MMCX antenna socket

Expendable Antenna

23C3: Bluetooth Hacking Revisited

Smyka Bluetooth Dongle V.2

YT: Bluetooth USB Hacking, add an external MMCX antenna socket

Expendable Antenna