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RFI CD51-65-53 UHF Ground Independent Mopole 380 - 440 MHz - MBC Base 5Mtr Cable no connector

RFI CD51-65-53 UHF Ground Independent Mopole 380 - 440 MHz - MBC Base 5Mtr Cable no connector

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RFI CD51-65-53 UHF Ground Independent Mopole 380 - 440 MHz - MBC BASE 5Mtr Cable no connector

When the CD51-65-53 gets mounted on a vehicle gutter or similar position, these UHF MopolesTM provide optimum performance with a largely omni-directional pattern. Due to the low angle of radiation inherent in the dipole antenna pattern, a 4.0 dB improvement in performance is typical when compared to a 3 wave whip in the centre of a metal roof.

The end fed design of the UHF MopolesTM incorporates a truly unique transformer in the base section. In this patented feed assembly, the dielectric of the coaxial feeder cable is trimmed to a set length and then introduced into the coil in termination. The result is a precisely matched feed which is so consistent that tuning to frequency from a chart becomes a matter of course. 

CD51 antennas are fitted with a flexible nylon radome over a copper element - ideal in industrial applications. 

There are two styles of mounting arrangements offered. The CD50-xx-70 and CD51-xx-70 versions mount via a threaded stud and nut assembly. The antenna can be easily terminated, tuned and re-terminated in the field using the instructions supplied. Its patented design allows the coaxial cable to be replaced in the field without specialised tools or soldering. 

The CD50-xx-50 and CD51-xx-50 versions mate with the MBC coaxial base providing an internal, permanent connection in a completely sealed unit. The MBC base is easy to install and allows the entire antenna to be removed and replaced at will.

• Versatile - Ground plane independence allows alternative mounting locations
• Performance - High performance and largely omni-directional pattern when not centre roof mounted
• Convenient - Patented design allows termination or retermination in seconds
• Flexible nylon whip
• Durable - Base coil is virtually indestructible
• Unique transformer design
• Australian Patents #596830 and #656793 

(1) Mopole™ antennas such as the CD50 and CD51 exhibit a 4dB improvement in performance over a ¼ wave whip but in pattern tests deliver only 2.0 to 2.5dB of actual gain. This improvement in performance can be attributed to a lower angle of radiation and is of particular benefit to users in rugged terrain conditions and in heavily built up city areas.
(2) Available preterminated with 5m 8058 RG58C/U. Use -73 or -53 suffix to replace -70 or -50 suffix. 



380 - 440MHz

Tunable Bandwidth

13 MHz @ <1.5:1 VSWR

Nominal Gain dBi



Field tune to minimum VSWR using supplied tuning chart

Power W


Cable and Connector

5M cable no connector. See note (2)

Whip Material

Copper braid element in flexible nylon tubing

Suggested Installation


Whip Length mm



13 MHz @ <1.5:1 VSWR


MBC Base (Included)



CD50/CD51 Technical Data Sheet

CD50/CD51 Installation Guide