VHF Sonobuoy Blade Antenna

136 to 175 MHz

SKU: 21-20-04

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VHF Sonobuoy Blade Antenna

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

Finish

  • Urethane Lusterless Black
  • Other finish options are available.
  • Please specify finish required when ordering.
Datasheet:

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