Activation for second RF Antenna PowerFlarm Core. Please enter your serial number (enter "0" if ordering together with a new PowerFlarm).
This feature license will activate the possibility to connect two FLARM antennas to your FLARM device; normally one on top of the aircraft and one on the bottom.
If your aircraft is of metal or carbon fiber, this option is highly recommended to extend the range of FLARM. With this option, your aircraft will not shield the FLARM signal anymore.