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Airborn Stub Antenna

30 to 512 MHz

SKU: 21-50-30

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Airborn Stub Antenna

Covering the full VHF/UHF JTRS frequency band, the 21-50-30 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 exceptional gain for such a small overall structure. 

  • Covers full JTRS VHF/UHF Comms band
  • Robust Fiberglass construction
  • Lightweight
  • Meets AS-3191 lightning strike requirements
  • Designed to meet MIL-STD-810 Environmental Specification
  • Low profile, 21 inch height
  • Omni-directional azimuthal radiation pattern
  • 50 Watts power handling
  • Gain from –24 to 0 dBi 
21-50-30
Model # 21-50-30
Brand Cooper Antennas
Frequency 30-512 MHz 
Gain

30 MHz -24 dBi

70 MHz -15 dBi

88 MHz -12 dBi

108-174 MHz -3 dBi average

225-512 MHz 0 dBi average 

VSWR

30-174 MHz ≤ 2.5:1

225-512 MHz ≤ 2.5:1 

Impedance (nominal) 50 Ohms
Power 50 Watts 
Polarization Vertical
Radiation Pattern Omni directional in azimuth plane 
Antenna RF Connector TNC Female
Antenna Shell Type Fiberglass element in aluminium base collar 
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 Standard
  • Other finish options are available.
  • Please specify finish required when ordering.
Datasheet:

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