UHF Ground Independent Mopole™, 450-520MHz, 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.

Call or email RFI to place an order at (330) 486-0706 or [email protected]
SKU: CD51-68-70 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 450-520MHz
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 Copper braid element in flexible nylon tubing
Suggested Installation Bracket
Whip Length mm 360
VSWR 13 MHz @ <1.5:1 VSWR
Mounting Threaded stud
in else

PDF Downloads

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