Mounted two of six antennas outside my home avionics work bench: XPDR Separation 3 feet from COMM antenna Ground Plane 120mm COAX RG400 or RG393 COMM Separation 12 inches Ground Plane 1 metre square COAX RG400 or RG142B Flightbox Mount the ADS-B receiver antenna at least four (4) feet from transponder Mount antenna in accordance with manufacturer's instructions Fabricate or purchase a length of RG58 coaxial cable to run from the antenna to the FlightBox Pro. Use a connector appropriate to the antenna (typically BNC) on the antenna end of the cable. Use a male SMA connector on the splitter end of the cable. Connect the antenna to the splitter using the cable. Connect the splitter to the 1090 MHz output on the splitter to the 1090 MHz input on the FlightBox Pro using an SMA male / SMA male pigtail cable. Connect the splitter to the 978 MHz output on the splitter to the 978 MHz input on the FlightBox Pro using an SMA male / SMA male pigtail cable. TN72 not be mounted close to VHF COM transmitter antennas, and other antennas emitting high power