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Dual band VHF/UHF Airborne Blade Antenna

116-152 and 225-512 MHz

SKU: 21-50-27

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Dual band VHF/UHF Airborne Blade Antenna

The 21-50-27 is a vertically polarized, omni-directional antenna, compatible with airborne radios operating within the 116 to 152 and 225 to 512 MHz frequency ranges. The antenna can handle 70 watts of UHF and 25 watts of VHF power, requires no external tuning and is designed as a drop on replacement for AT1108/37R-2U types but having greater isolation between bands and better omni-directivity.

This dual band antenna is suited to military and civil aircraft applications where its rugged design ensures reliability in world wide conditions of service at speeds up to Mach 0.95.

Use of a surface deposited radiating element optimizes efficiency and the radiating element is DC grounded for static protection. 

  • High Strength
  • High isolation between VHF and UHF outputs
  • Fully Foamed for High Environmental Integrity
  • Aluminum Alloy Retaining Collar Accepts High Side Loading
  • Drop-on Replacement for AT-1108, 37R-2U and Chelton 12-17-4
  • Designed to MIL-STD-810
  • Excellent omnidirectional azimuth pattern 
21-50-27
Model # 21-50-27
Brand Cooper Antennas
Frequency 116-152 MHz (VHF) & 225 - 512 MHz (UHF) 
Gain

0 dBi average VHF

+2 dBi average UHF 

VSWR

≤ 2.25:1 VHF

≤ 2.0:1 UHF  

Impedance (nominal) 50 Ohms
Power

25 Watts CW VHF

70 Watts CW UHF 

Isolation between UHF and VHF  ≥ 40 dB 
Polarization Vertical
Radiation Pattern

Azimuth : Omni-directional

Elevation : Similar to stub 

Antenna RF Connector

TNC Female UHF

BNC Female VHF 

Antenna Shell Type High density foam filled epoxy/fiberglass shell set in aluminum alloy base collar
Height 14.65 inches max (372mm) 
Weight 4.0 lbs max (1.82kg) 
Side Loading  ≥ 8 psi ultimate 
Base Plate Shape Tear drop 
Fixing Holes 6 x Ø 0.234 inches (5.9mm) holes, counter bored top side Ø 0.39 inches (9.9mm)

Finish

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

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