Aviation's Panel Mount Avionics Installation Leader

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


  • 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

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California Residents:

Prop 65 Warning: This product may contain chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm.