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VHF/UHF Airborne Blade Antenna

108 to 174 MHz & 225 to 400 MHz

SKU: 21-50-43

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VHF/UHF Airborne Blade Antenna

The 21-50-43 is a dual band VHF/UHF communications antenna intended for use on high speed aircraft . Its construction is from precision machined aluminium alloy with high strength glass/epoxy inserts. Having a low profile diamond shape raked blade structure minimizes drag for high speed applications and presents a low Radar Cross Section (RCS). The aluminium structure also lends itself to the application of certain types of ’stealth’ radar absorbing material.

The electrical design comprises a UHF sleeved unipole, the upper element of which acts as a "choke" enabling a capacitive horizontal rod to operate as a top loaded VHF monopole, decoupled from the UHF section.

Designed and constructed to meet MIL-STD-810 environmental conditions, the 21-50-43 is a drop-on footprint replacement for UHF blade type AT-256, having a single N-type Female connector. The antenna is normally finished in lusterless grey urethane paint. 

21-50-43
Model # 21-50-43
Brand Cooper Antennas
Frequency

108 - 174 MHz

220 - 400 MHz 

Gain

108 - 174 MHz -2 dBi min 0 dBi average

220 - 400 MHz 0 dBi min +2 dBi average 

VSWR

108 - 115 MHz ≤ 3.0:1

116 - 174 MHz ≤ 2.5:1

220 - 270 MHz ≤ 2.0:1

271 - 375 MHz ≤ 2.25:1

376 - 400 MHz ≤ 3.0:1

Impedance (nominal) 50 Ohms
Power 50 Watts max
Polarization Vertical
Radiation Pattern Nominally omni directional in azimuth plane
Antenna RF Connector N Female
Antenna Shell Type Diamond shaped aluminium alloy with fibre glass inserts 
Height 12.42 inches (315 mm)
Weight 2.2 lbs (0.99 kg) 
Base Plate Shape Diamond shape drilled to replace AT-256 
Fixing Holes 6 x Ø 0.200 inches (5mm) holes, counter sunk at 100° Ø 0.39 inches (9.9mm)  

Finish

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

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