The CI 121 VHF comm rod antenna has a small diameter and has a light weight at only 0.5 pounds. This antenna features a tapered glass laminate housing and die-cast aluminum base. It 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.
FEATURES
SPECIFICATIONS
Frequencies covered: 118–137 MHz
Ideal for single-engine aircraft
Weight:
0.5 lb
Dimensions (height):
18.5 in
Material:
cast housing / fiberglass whip
Finish:
polyurethane enamel
Connector:
BNC (female)
Frequency: 
118 MHz to 137 MHz
VSWR:
2.5:1, maximum
Polarization:
Vertical
Radiation pattern:
omnidirectional 
Impedance:
50Ω
Power RF:
50 Watts
Temperature:
-55°C to 85°C
Altitude: 
50,000 ft
PRODUCT CODES
Mfr Part No:
CI 121
ECCN:
7A994
PROAPP:
PT2316NM
SCHEDULE B CODE:
8529.10.4000
TSO:
C37d, C38d