The RFI CD28-41-50-161 VHF Mopole Antenna delivers a 3 dB gain at its 161 MHz centre frequency and operates across 148 - 175 MHz after field tuning. Supplied with an MBC right-angle SO-239 roof-mount base (cable ordered separately), this ground-independent, no-tune antenna excels on non-traditional mounting points such as gutters, mirrors, and trunk lips. A patented matching circuit sealed in a virtually indestructible thermoplastic body and a flexible 17-7 PH stainless-steel whip ensure reliable, long-term performance in harsh mobile environments.

Product Features:

• The Mopole architecture provides a 3 dB gain improvement over a conventional ¼-wave whip.
• It delivers broad 148 - 175 MHz coverage with a tuned bandwidth of 4 MHz at 1.5:1 VSWR (8 MHz at 2.0:1 VSWR) and can be field-tuned using the supplied chart.
• The ground-independent design maintains full performance when mounted on gutters, mirrors, trunks, or other unconventional locations.
• The patented end-fed matching circuit is encapsulated in a high-impact thermoplastic housing, ensuring consistent 50 Ω impedance and virtual indestructibility.
• The flexible, tapered stainless-steel whip features a durable black powder coating that resists corrosion, vibration, and low-clearance impacts.
• The included MBC right-angle SO-239 base enables quick, secure installation (coaxial cable and connector supplied separately).
• This antenna is Australian designed, manufactured, and patented (AU #596830 & #656793) for dependable performance in extreme conditions.

Application Areas:

• This antenna is ideal for fleet trucks, service vans, and logistics vehicles that require broadband VHF coverage without a full roof ground plane.
• It is suitable for public-safety, fire, and EMS units requiring rugged antennas that can mount on mirrors, roof gutters, or trunk lips.
• It performs reliably on mining, construction, and agricultural machinery operating in high-vibration, impact-prone environments.
• It benefits urban delivery and rural logistics vehicles where flexible mounting options overcome space or clearance constraints.
• It is well-suited for marine and recreational off-road vehicles that require corrosion-resistant, impact-tolerant whips.

In the Box:

• 1 x RFI CD28-41-50-161 VHF Mopole Antenna Whip (161 MHz centre, 3 dB gain).
• MBC right-angle SO-239 roof-mount base pre-assembled to the whip.

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 CD28-41-50 Antenna - Installation Guide