Airborne Stub Antenna

65 to 125 MHz

SKU: 21-20-12

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Airborne Stub Antenna

Covering the 65-125 MHz VHF frequency band, the 21-20-12 is a lightweight broadband stub antenna intended for helicopter and moderate speed aircraft.

Construction uses an advanced fiberglass covered radiating element bonded into a machined aluminum base.

Unique double trap design ensures good elevation pattern throughout the frequency band and passive matching housed within the base maintains VSWR within 2.5:1 and provides excellent gain for such a small overall structure. 

  • Covers limited VHF Comms band
  • Robust Fiberglass construction
  • Lightweight
  • Designed to meet MIL-STD-810 Environmental Specification
  • Low profile, 21 inch height
  • Omni-directional azimuthal radiation pattern
  • 50 Watts power handling
  • Gain from -15 to -10 dBi 
21-20-12
Model # 21-20-12
Brand Cooper Antennas
Frequency 65 - 125 MHz
Gain (at beam max) 65 MHz -15 dBi 125 MHz better than -10 dBi 
VSWR 65-125 MHz ≤ 2.5:1 
Impedance (nominal) 50 Ohms
Power 50 Watts
Polarization Vertical
Radiation Omni directional in azimuth plane
Antenna RF Connector  TNC Female
Antenna Shell Type  Glass/Epoxy element in aluminum alloy base collar with internal printed circuit element 
Height 21 inches (533mm) 
Weight 0.9 lbs (0.4kg)
Base Plate Shape Circular
Fixing Holes 4 x Ø 0.196 inch (5mm) holes, counter sunk 100°. 

Finish

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

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