VHF Airborne Blade Antenna

70 to 80 MHz

SKU: 21-20-75

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VHF Airborne Blade Antenna

The 21-20-75 is a high performance VHF receive only airborne blade antenna suitable for use on fixed and rotary wing aircraft.

Construction is from a one piece fiberglass 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 21-20-75 to meet the lightning protection requirements of AS-3191/A.

Internal matching elements produce minimum VSWR and enable close phase/amplitude matching making these antennas suitable for use in homing and DF systems. The antenna assembly is sealed by closed cell foam and finished in lusterless black paint. 

21-20-75
Model # 21-20-75
Brand Cooper Antennas
Frequency 70 MHz to 80 MHz 
Gain (typical)  -20 dBi 
VSWR ≤ 2.0:1 
Impedance (nominal) 50 Ohms
Power 1 Watts
Polarization Vertical (when mounted vertically) 
Radiation Omni directional in azimuth plane Elevation - see graph
Antenna RF Connector  N Female
Construction Epoxy/fiberglass blade in aluminum alloy base collar
Height 9 inches (229mm)
Weight 0.9 lbs (0.4kg) 
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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