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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.
MODEL CI 121 VHF Antenna | |
Electrical | |
Frequency | 118 - 137 MHz |
VSWR | 2.5:1 Maximum |
Polarization | Vertical |
Radiation Pattern | Omnidirectional |
Impedance | 50 Ohms |
Power | 50 Watts |
Mechanical | |
Weight | 0.5 lbs. Maximum |
Height | 18.50 in. Maximum |
Material | Cast housing/ Fiberglass whip |
Finish | Polyurethane Enamel |
Connector | BNC (female) |
Environmental | |
Temperature | -55ºC to +85ºC |
Altitude | 50,000 ft. |
Air Speed | 250 Knots TAS |
Federal Specifications | |
RTCA Environmental | DO-160D |
Environmental Category
| [D2X]ACB[R(C,C1)U(F,F1) XWFDXSXXXXX[XX]X[XXXX]XAX |
FAA TSO | C37d, C38d |
RTCA MOPS | DO-186A |
ORDER OPTIONS | |
Connector | |
BNC | Standard |
Color | |
White | Standard |
Gasket | |
C12607-3 Cork Neoprene |

Approvals and Conformities
Product Attributes

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.
MODEL CI 121 VHF Antenna | |
Electrical | |
Frequency | 118 - 137 MHz |
VSWR | 2.5:1 Maximum |
Polarization | Vertical |
Radiation Pattern | Omnidirectional |
Impedance | 50 Ohms |
Power | 50 Watts |
Mechanical | |
Weight | 0.5 lbs. Maximum |
Height | 18.50 in. Maximum |
Material | Cast housing/ Fiberglass whip |
Finish | Polyurethane Enamel |
Connector | BNC (female) |
Environmental | |
Temperature | -55ºC to +85ºC |
Altitude | 50,000 ft. |
Air Speed | 250 Knots TAS |
Federal Specifications | |
RTCA Environmental | DO-160D |
Environmental Category
| [D2X]ACB[R(C,C1)U(F,F1) XWFDXSXXXXX[XX]X[XXXX]XAX |
FAA TSO | C37d, C38d |
RTCA MOPS | DO-186A |
ORDER OPTIONS | |
Connector | |
BNC | Standard |
Color | |
White | Standard |
Gasket | |
C12607-3 Cork Neoprene |