UHF Communications Antenna

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The 21-30-71 is a lightweight, single hole fixing UHF “whip” antenna suitable for helicopters or aircraft operation up to 350 knots.

The antenna design features a radiating element encapsulated within a strong glass-epoxy tube which in turn is integrated into an aluminum alloy base containing a TNC connector and loss-less matching cavity.

Installation requires insertion into a 17.5mm (11/16in) hole in the airframe and securing with the washes and nuts provided.

Very light weight
Narrow Band UHF/FM operation
Single hole fixing
Suitable for up to 350 knots
TNC female connector

	21-30-71
Model #	21-30-71
Brand	Cooper Antennas

Frequency	443-450 MHz
Gain	≥ +3.5 dBi at beam max
VSWR	≤ 1.5:1 across band ≤ 1.2:1 @ 446.7 MHz
Impedance (nominal)	50 Ohms
Power	50 Watts CW
Polarization	Vertical (when vertically mounted)
Radiation	Omni-directional in azimuth within 0.25 dB when vertically mounted
Antenna RF Connector	TNC Female