BJ-180 Swing Sight Compass 5004-00 The 104-17 transponder antenna is

The 104-17 transponder antenna is a mono-pole antenna that has a top loaded sphere which creates a factor of reliability and safety for a shorter antenna

975 MHz in 25 kHz channel increments

Double flute construction takes less pressure

MS24693C Series countersunk screws feature a 100 degree flat head and are made of stainless steel material

BJ-180 Swing Sight Compass 5004-00 The 104-17 transponder antenna isThe BJ 180 sight compass is used to check the aircraft compass for accuracy. It has a reversed card so pilot and swinger read the same heading. It is painted red for clear identification and must not be installed in any aircraft. Comes complete with plastic case and easy to follow instructions.