Airborne Blade Antenna

400 to 500 MHz

SKU: 21-30-55

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Airborne Blade Antenna

The 21-30-55 is a high performance combined UHF airborne blade antenna suitable for helicopters and aircraft operating in excess of Mach 1.

Construction is from a one piece glass loaded thermoplastic blade molding intimately bonded into an aluminum alloy base block which houses the matching circuits and provides for very solid attachment to the airframe via 6 fixing holes drilled to the same pattern as the AT-256 UHF antenna.

The metal base block also enables the 21-30-55 to meet the lightning protection requirements of MIL-STD-85670.

Internal radiating element are shaped in such a way as to produce minimum VSWR and also to optimize radiation. The antenna assembly is sealed by closed cell foam and finished in lusterless black or grey urethane paint. 

  • Covers UHF EPLRS Frequencies
  • High Strength Composite Blade with Aluminum Alloy Base Block
  • Low Side Area, Low Drag
  • Single ‘N’ Type Connector
  • Drop-on replacement for AT-256
  • Meets Lightning Strike Criteria of MIL-STD-85670
  • Environmental Performance to MIL-STD-810
  • Foamed in place radiating element
21-30-55
Model # 21-30-55
Brand Cooper Antennas
Frequency 400 MHz to 500 MHz
Gain + 2 dBi 
VSWR

≤ 2.5:1 (400 - 500 MHz)

≤ 2.0:1 (420 - 450 MHz)

Impedance (nominal) 50 Ohms
Power 100 Watts CW 
Polarization Vertical
Radiation Omni directional in azimuth plane
Antenna RF Connector  N Female
Antenna Shell Type Glass loaded thermoplastic blade in aluminum alloy base collar
Height 5 inches (127mm) 
Weight 0.75 lbs (0.34kg) 
Side Loading ≥ 8 psi ultimate
Base Plate Shape Diamond shape 
Fixing Holes 6 x Ø 0.203 inch (5.2mm) holes, counter bored Ø 0.43 inches (10.9mm)

Finish

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

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