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Broadband Airborne Blade Antenna

30 to 400 MHz

SKU: 21-50-20

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Broadband Airborne Blade Antenna

The 21-50-20 is a vertically polarized, omni-directional antenna, compatible with all popular airborne radios operating within the 30 to 400 MHZ frequency range.

The 21-50-20 antenna can handle 50 Watts of power and requires no external tuning. The 21-50-20 is a wideband, multi-function antenna developed by Cooper Antennas Ltd and is particularly suited to tactical military communications. Rugged design ensures reliability in world wide conditions of service on aircraft operating at speeds up to Mach 1.0.

Use of a surface deposited radiating element optimizes efficiency. The element is DC grounded for lightning protection. 

  • High Strength Broadband Blade Antenna
  • Frequency Selective Matching Network
  • Fully Foamed to Provide High Environmental Integrity
  • Aluminum Alloy Retaining Collar Accepts High Side Loading
  • Equivalent to AS-3191/A & AS-3793/A
  • Suitable for AN/ARC-182, AN/ARC-186 and Similar Multi-Mode Radios
  • Complies with MIL-STD-810
  • Meets Requirements of NSN 5985-01-134-2291
  • Meets MIL-DTL-8567B lightning protection requirements 
21-50-20
Model # 21-50-20
Brand Cooper Antennas
Frequency

30 - 88 MHz

108 - 174 MHz

225 - 400 MHz

Gain

30 MHz ≥ - 23.0 dBi

88 MHz ≥ - 11.0 dBi

108-174 MHz -3.0 dBi average

225-400 MHz +3.0 dBi average 

VSWR

≤ 2.5:1 30 - 88 MHz

≤ 2.5:1 108 - 118 MHz

≤ 2.0:1 118 - 174 MHz

≤ 2.0:1 225 - 400 MHz 

Impedance (nominal) 50 Ohms
Power 50 Watts CW 
Polarization Vertical
Radiation Pattern

Azimuth : Omni-directional

Elevation : As stub 

Antenna RF Connector BNC Female
Antenna Shell Type High density foam filled epoxy/fiber glass shell set in aluminum alloy base collar 
Height 14.6 inches (371mm) 
Weight 0.9 lbs (0.4kg)
Side Loading  ≥ 8 psi ultimate 
Base Plate Shape Tear drop
Fixing Holes 6 x Ø 0.234 inches (6mm) holes, counter sunk at 100° Ø 0.39 inches (9.9mm) 

Finish

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

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