MARKER BEACON ANTENNA/Low profile, flange mounting, BNC Female UG-89 Connector, 6 Hole Mount, & a White Finish. DM N43-4

The N43 series navigation antennas for general aviation aircraft is a low profile antenna for use with 75 MHz marker beacon receivers. Designed to be mounted on the bottom of the aircraft, the N43 provide a broad, single-lobed pattern that's directed downward. The N43-4 is rugged enough for use on all subsonic aircraft.
 

This N43-3 marker beacon antenna (Alternate Part# DM N43-4) has a BNCf connector, flange mounting, and painted white.