VHF Airborne Blade Antenna

167.5 to 192.5 MHz

SKU: 21-20-05

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VHF Airborne Blade Antenna

The 21-20-05 is a high performance VHF airborne blade antenna suitable for helicopters and sub-sonic aircraft.

Construction is from a one piece glass loaded thermoplastic blade moulding intimately bonded into a composite 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.

Internal radiating elements 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. 

  • High Strength Composite Blade
  • Low Side Area, Low Drag
  • Single ‘N’ Type Connector Drop-on replacement for AT-256
  • Environmental Performance to MIL-STD-810
  • Foamed in place radiating element
21-20-05
Model # 21-20-05
Brand Cooper Antennas
Frequency 167.5 MHz to 192.5 MHz 
Gain (typical)  +1 dBi when mounted at center of an 8 foot (2.4m) minimum diameter ground plane.  
VSWR ≤ 2.5:1 
Impedance (nominal) 50 Ohms
Power 25 Watts CW
Polarization Vertical (when mounted vertically) 
Radiation Omni directional in azimuth plane
Antenna RF Connector  N Female
Antenna Shell Type  Glass loaded thermoplastic blade in a composite base collar
Height 9 inches (229mm) 
Weight 0.66 lbs (0.3kg) 
Side Loading ≥ 6 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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