DM N43 Airborne Marker Beacon Antenna | 74.75–75.25MHz, BNCf Connector, White A27127-29 The 301F-A has a 3-pin

The 301F-A has a 3-pin temperature probe and orange LED lighting

The Fluke Model C1600 is a rugged

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The MT version has one layer of fiberglass with neoprene and visible steel wire spiral inside the hose

and a 5kΩ impedance

DM N43 Airborne Marker Beacon Antenna | 74.75–75.25MHz, BNCf Connector, White A27127-29 The 301F-A has a 3-pinThe 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 1 is rugged enough for use on all subsonic aircraft.