RFI CD51-68-50 450-520MHz Ground Independent Mopole - MBC Base (Flexible PVC Radiator)
$146.78
GST Inclusive. Discounts and Shipping calculated at checkout.
Quantity
Pickup available from the Mobile Systems Showroom: 1/14 Portside Drive, Mount Maunganui. We will notify you when your order is ready for collection.
In stock, ready to be shipped
UHF Ground Independent Mopole Antenna, 450–520MHz, 4dB Gain
The RFI CD51-68-50 is a heavy-duty UHF mobile antenna designed for professional two-way radio systems operating across the 450–520MHz frequency range. MBC base included, cable and connector sold separately.
Overview
The CD51-68-50 is a Ground Independent Mopole antenna delivering a genuine 4dB improvement over a standard 1/4-wave whip, thanks to its patented feed design. It's built for commercial fleets, emergency services, utilities, mining, transport, agriculture, and industrial applications that need dependable UHF communications.
Its flexible PVC radiator over a copper element resists impacts, vibration, and harsh weather, and because it doesn't rely on the vehicle body as a ground plane, it can be mounted in alternative positions like bull bars, mirror brackets, roof racks, canopies, and toolboxes where a traditional roof-centre antenna won't work.
Need a different band or mount type? This antenna is also part of a wider CD51 series, see "Other Options in This Series" below.
Key Features
- 4dB gain over a standard 1/4-wave whip means stronger signal for fleet vehicles that can't fit a full-size roof-mount antenna.
- Ground Independent Mopole design means reliable performance from bull bars, mirror brackets, canopies, and other non-standard mounting positions.
- Flexible PVC radiator over a copper element means it resists knocks, vibration, and low-clearance impacts without permanent damage.
- Heavy-duty MBC mounting base included means a secure, proven installation standard trusted by fleet operators.
- Field-tuneable with supplied chart means you can dial in the best VSWR for your exact operating frequency within the band.
- Suitable for analogue and digital radio systems means one antenna works across mixed fleets running older and newer radios.
Applications
- Commercial fleet, transport, and logistics vehicles
- Emergency services and local government
- Utilities, mining, and civil construction
- Agriculture and forestry equipment
- Vehicles needing alternative mounting positions (bull bars, canopies, toolboxes, fibreglass panels)
What's in the Box
- 1 x RFI CD51-68-50 Mopole antenna with MBC base
- Tuning chart
- Not included: coaxial cable and connector, sold separately
Complete Your Setup
This antenna's MBC base doesn't include a cable or connector. Talk to us and we'll help you choose the right cable length and connector for your installation.
Key Specifications
| Brand | RFI |
| Model | CD51-68-50 |
| Frequency range | 450–520MHz |
| Gain | 4dB over a 1/4 wave whip |
| Tuned bandwidth / VSWR | 13MHz at <1.5:1, field-tuneable using supplied chart |
| Power handling | 50W |
| Whip length | 360mm |
| Whip material | Copper braid element in flexible PVC/nylon tubing |
| Mounting | MBC base, included (no cable) |
Spec sheet PDF linked below covers the CD50/CD51-68-5x installation family; please confirm with us if you need CD51-specific (PVC whip) diagrams.
Download the installation sheet (PDF)
Other Options in This Series
The CD51 series covers other bands and mount types. See CD51-68-70 (450-520MHz, threaded stud mount) for the same band with a different mount, or CD51-65-70 and CD51-65-53 for the 380-440MHz band. These are different configurations or bands, not direct substitutes, so pick the one that matches your licensed frequency.
Video
No product video currently available for this model.
Why Buy From Mobile Systems Limited?
Mobile Systems Limited supplies professional mobile radio systems and antenna solutions throughout New Zealand from our base in Mt Maunganui, Bay of Plenty. Our team provides:
- Fleet communication system design
- Vehicle antenna selection
- Professional installations
- Antenna testing and VSWR optimisation
- Ongoing servicing and technical support
Whether you're fitting out one vehicle or an entire fleet, we'll help you select the right antenna solution for dependable long-term performance.
Frequently Asked Questions
What frequencies does the CD51-68-50 support?
The antenna operates across the 450–520MHz UHF frequency range, making it suitable for many licensed analogue and digital radio systems.
What is Ground Independent Mopole technology?
Ground Independent Mopole technology enables the antenna to perform efficiently without relying on the vehicle body as a ground plane, giving installers greater flexibility when selecting a mounting location.
What are the benefits of the flexible PVC radiator?
The flexible PVC radiator provides excellent resistance to impacts, vibration, UV exposure, and harsh weather, making it ideal for commercial, industrial, and off-road vehicles.
Does the antenna include a mounting base?
Yes. The CD51-68-50 is supplied with a heavy-duty MBC mounting base, but cable and connector are sold separately.
Is the antenna suitable for digital radio systems?
Yes. It is compatible with both analogue and digital UHF radio systems operating within the 450–520MHz frequency range.
Can Mobile Systems Limited install this antenna?
Yes. We supply, install, test, tune, and support RFI antenna systems and complete two-way radio solutions for commercial, industrial, and government customers throughout New Zealand.
Specifications
RFI CD51-68-50 450-520MHz Ground Independent Mopole - MBC Base (Flexible PVC Radiator)
$146.78