UHF Ground Independent Mopole™, 380-440MHz, Threaded Stud

The CD50 and CD51 Series UHF ground independent MopoleTM antennas are versatile and popular antennas, providing excellent performance in virtually any mounting position.

SKU: CD50-65-70 Category:

The CD50 and CD51 Series UHF ground independent Mopole™ antennas are versatile and popular antennas, providing excellent performance in virtually any mounting position.
When mounted on a vehicle gutter or similar position, these UHF Mopoles™ provide optimum performance with a largely omnidirectional 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 center of a metal roof.
The end-fed design of the UHF Mopoles™ 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. CD50 antennas have an elegant and durable tapered stainless steel whip section.
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 specialized 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 center roof-mounted
• Convenient – Patented design allows termination or retermination in seconds
• Stainless steel whip or flexible nylon whips cater to individual needs
• 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.

Band 380 – 440MHz
Tunable Bandwidth 13 MHz @ <1.5:1 VSWR
Nominal Gain dBi 4dB over a ¼ wave. See note (1)
Tuning Field tune to minimum VSWR using supplied tuning chart
Power W 50
Cable and Connector Not included, order separately. See note (2)
Whip Material 17-7 PH Stainless steel
Suggested Installation Bracket
Whip Length mm 395
VSWR 13 MHz @ <1.5:1 VSWR
Mounting Threaded stud
in else

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Shipping Weight (lbs.) 5
Shipping Dims (inches) 16x6x7