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Multi-band FM Communications Antenna

136 to 174 & 380 to 870 MHz

SKU: 21-50-45

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Multi-band FM Communications Antenna

The 21-50-45 is a multi-band, vertically polarized communications antenna particularly suited to latest generation VHF/UHF FM/data link radios.

Designed as a short, top loaded monopole, excellent performance is achieved throughout the frequency range by use of frequency selective matching and decoupling circuits. Mechanical construction uses a glass reinforced thermoplastic shell with foamed-in-place internal elements. A single N-type connector is fitted to the aluminium base plate and is DC grounded for p-static protection. 

  • Wide bandwidth covers all commercial VHF and UHF FM frequencies. .
  • Small size only 10 inches height.  25 watts power handling.
  • Can be used with external diplexer/ triplexer for simultaneous multiband operation.
  • Passive design does not require external tuning.
  • Designed to environmental requirements for helicopter and subsonic transport aircraft. 
21-50-45
Model # 21-50-45
Brand Cooper Antennas
Frequency 136-174 & 380-870 MHz 
Gain

VHF ≥ 0 dBi average

UHF ≥ +3 dBi average

VSWR

≤ 2.35:1 136-174 MHz

≤ 2.0:1 380-520 MHz

≤ 2.4:1 760-870 MHz

Impedance (nominal) 50 Ohms
Power 25 Watts max 
Polarization Vertical
Radiation Pattern Nominally Omni-directional in azimuth Elevation-see graphs
Antenna RF Connector N Female
Temperature -56°C to +71°C 
Height 10 inches (254mm) 
Weight 1.5 lbs (0.68 kg) max 
Fixing Holes 6 holes 0.2 inches (5.08mm) diameter nominal - replaces AT256 

Finish

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

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