Low profile UHF Airborne Blade Antenna

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The 21-30-23 is a high performance UHF airborne blade antenna suitable for helicopters and subsonic aircraft.

Mechanical design of the blade comprises an internal printed circuit, foamed-in-place into a high strength epoxy-glass radome fitted to an aluminum alloy base block having an integral mounting flange and finished in urethane lusterless black.

Structural design ensures high side loading acceptance and the antenna is completely sealed for reliable performance in worldwide conditions of service.

Covers UHF Communications and EPLRS
High Strength Composite Blade with Aluminum Alloy Base Block
Single ‘TNC’ Connector
Environmental Performance to MIL-STD-810
Fully sealed for environmental integrity.

	21-30-23
Model #	21-30-23
Brand	Cooper Antennas

Frequency	225 MHz to 450 MHz
Gain	See graph
VSWR	≤ 2.5:1
Impedance (nominal)	50 Ohms
Power	50 Watts CW
Polarization	Essentially Vertical (when mounted vertically)
Radiation	Nominally omni directional in azimuth plane Elevation, see diagram
Antenna RF Connector	TNC Female

Antenna Shell Type	Glass loaded resin plastic blade
Height	6 inches (152mm)
Weight	1.5 lbs (0.68kg)
Side Loading	≥ 6 psi ultimate
Fixing Holes	4 x Ø 0.209 inches (5.3mm) holes, counter sunk 100° Ø 0.413 inches (10.5mm)