The RFI CD28-41-53-158 VHF Mopole™ Antenna delivers a 3 dB gain at its 158 MHz centre frequency and operates across 148 – 175 MHz after field tuning. Supplied with an MBC right-angle SO-239 roof-mount base and a factory-fitted 5 m low-loss coaxial cable (unterminated), this ground-independent, no-tune antenna excels on non-traditional mounting points such as gutters, mirrors, or trunk lips. A patented matching circuit sealed in a virtually indestructible thermoplastic body and a flexible 17-7 PH stainless-steel whip provides reliable, long-term performance in demanding fleet, public-safety, and industrial environments.

Product Features:

• This antenna’s Mopoleâ„¢ architecture provides a 3 dB improvement in received signal levels compared with a conventional ¼-wave whip, extending communication range.
• It delivers broad 148 – 175 MHz coverage with a tuned bandwidth of 4 MHz at a 1.5 : 1 VSWR (8 MHz at 2 : 1) and can be field-tuned using the supplied chart for optimum performance.
• The patented end-fed matching circuit is encapsulated in a high-impact thermoplastic housing, ensuring consistent 50 Ω impedance and exceptional durability.
• The tapered stainless-steel whip features a tough black powder coating that resists corrosion, vibration, and low-clearance impacts while preserving signal integrity.
• The ground-independent design maintains full performance when mounted on gutters, mirrors, trunks, or other unconventional locations, providing installation flexibility.
• The included MBC right-angle SO-239 base is pre-assembled to a 5 m low-loss coaxial cable (connector not fitted), allowing quick custom termination in the field.
• This antenna is Australian designed, manufactured, and patented (AU #596830 & #656793) for dependable operation in harsh local conditions.

Application Areas:

• This antenna is ideal for fleet trucks, service vans, and logistics vehicles that require strong broadband VHF coverage without a full roof ground plane.
• It is suitable for public-safety, fire, and EMS units that need a rugged solution capable of mounting securely on mirrors, roof gutters, or trunk lips.
• It performs reliably on mining, construction, and agricultural machinery operating in vibration-prone, impact-intensive environments where flexibility and durability are critical.
• It benefits urban delivery and rural logistics vehicles where space constraints or overhead obstructions demand versatile mounting options.
• It is well-suited for marine and recreational off-road vehicles that require a corrosion-resistant, impact-tolerant whip and ground-independent performance.

In the Box:

• 1 × RFI CD28-41-53-158 VHF Mopoleâ„¢ Antenna Whip (158 MHz centre, 3 dB gain).
• MBC right-angle SO-239 roof-mount base pre-assembled to the whip.
• 5 m low-loss coaxial cable (unterminated, connector not included).

Notes:

• Mopole antennas such as the CD28 have been shown to exhibit a 3 dB improvement in received signal level in the field when compared to a ¼ wave whip however in pattern tests exhibit only 1.5 to 2 dB over a ¼ wave (equivalent to 1.5-2 dBi). This improvement in performance can be attributed to a lower radiation angle level of these ground independent antennas.
• Available pre-terminated with 5m 8058 RG58C/U. Use -73 or -53 suffix to replace -70 or -50 suffix.

Documents:

RFI CD28 Antenna - Datasheet RFI CD28-41 Antenna - Installation Guide