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COMANT VHF Communication Antenna CI-121

Similar to the CI-109, the CI-121 is smaller in diameter and lighter at only 0.5 pounds. Features a tapered glass laminate housing and die-cast aluminum base. Offers standard mounting and appearance to many Cessna communication antennas.

The CI-121 has been re-tested and upgraded to the new RTCA DO-160D environmental requirements and offers the 118 to 137 MHz frequency associated with DO-186A MOPS.


Frequencies Covered

  • 118-137 MHz

Available Options

Part NumberDescriptionConditionPriceAvailabilityStockOrder Qty 
CI-121COMANT VHF Communication Antenna CI-121NEW$630.00In stock1
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  • Frequency: 118-137
  • VSWR: 2.5:1 Maximum
  • Polarization: Vertical
  • Radiation Pattern: Omnidirectional
  • Impedance RF: 50 Ohms
  • Power RF: 50 Watts



  • Weight: 0.5 lbs Max.
  • Height: 18.50 inches Max.
  • Material: Cast Housing / Fiberglass whip
  • Finish: Polyurethane Enamel
  • Connector: BNC (female)


  • Temperature: -55 to +85 Celcius
  • Altitude: 50,000 ft.
  • Airspeed: 250 KTAS

Federal Specifications

  • FAA TSO C37d, C38d
  • RTCA Environmental DO-160D


  • B12607-3 Cork Neoprene
  • CI-121 VHF Antenna


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