VHF Sonobuoy Blade Antenna

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The 21-20-04 is a high strength low drag VHF blade antenna. It comprises a top loaded symmetrical diamond shape blade with internal foamed-in-place radiating and matching elements.

A single N-type connector is fitted to the aluminum base plate and the antenna is DC grounded for P-static protection.

High Strength Composite Blade set into Aluminum Alloy Base Block
Low Side Area, Low Drag
Suitable for helicopters and aircraft operating up to at least 350 knots
Environmental Performance to MIL-STD-810
Radiating element foamed-inplace for structural integrity and prevention of moisture ingress.

	21-20-04
Model #	21-20-04
Brand	Cooper Antennas

Frequency	136 MHz to 175 MHz
Gain (typical)	≤ 0 dBi average, -1 dBi min
VSWR	≤2.5:1
Impedance (nominal)	50 Ohms
Power	25 Watts CW
Polarization	Vertical (when mounted vertically)
Radiation	Omni directional in azimuth plane, elevation as plot
Antenna RF Connector	N Female

Antenna Shell Type	Glass loaded thermoplastic blade in aluminum alloy base collar with aluminum top loading disc
Height	10 inches (254mm)
Weight	2.5 lbs max (1.13kg)
Fixing Holes	6 holes 0.2 inches dia. nominal - replaces AT256