The RFI CD51-65-53 UHF Mopole Antenna is a high-performance, 4 dB gain antenna designed for reliable communication across the 380–440 MHz frequency range with a versatile end-fed design and patented feed assembly. The CD50/CD51 antennas provide performance with a largely omni-directional pattern when they are mounted on a vehicle gutter or similar position. This is due to the low angle of radiation inherent in the dipole antenna pattern, resulting in a typical 4.0 dB improvement in performance compared to a 3-wave whip in the center of a metal roof.

Product Features:

• The antenna features a unique end-fed transformer design in its base, ensuring consistent RF performance across all frequencies.
• The patented feed assembly enables precise impedance matching through adjustable coaxial dielectric trimming.
• Its omnidirectional radiation pattern delivers up to 4 dB of gain compared with a conventional ¼-wave antenna.
• The low-angle radiation design allows reliable operation when mounted in non-center roof positions.
• The MBC coaxial base supports versatile mounting options and provides a permanent, sealed connection.
• The rugged base coil construction ensures long-term durability under harsh environmental conditions.
• The antenna is available with stainless-steel (CD50 series) or nylon (CD51 series) whip options to suit different installation requirements.
• The design is protected by Australian Patents #596830 and #656793, guaranteeing proprietary performance features.

Application Areas:

• This antenna is ideal for vehicle-mounted radio communication systems used by emergency services and fleet management operations.
• It is well suited for industrial and mining vehicles that require robust UHF antenna performance in demanding environments.
• The design performs reliably in installations where center-roof mounting is not possible, such as on fenders or bull bars.
• The MBC base configuration accommodates custom communication setups requiring sealed, permanent installations.

In the Box:

• 1 x RFI CD51-65-53 UHF 4 dB Mopole Antenna
• 1 x MBC Coaxial Base
• Cable and connector (sold separately)

Mounting Arrangements:

• CD50-xx-70 and CD51-xx-70: Mount via a threaded stud and nut assembly, allowing easy termination, tuning, and re-termination in the field.
• CD50-xx-50 and CD51-xx-50: Mate with the MBC coaxial base, providing an internal, permanent connection in a completely sealed unit.

Documents:

RFI CD51 UHF Antenna - Datasheet RFI CD51-65 UHF Antenna - Installation Guide