The RFI CD28-41-50-158 VHF Mopole Antenna delivers a 3 dB gain at the factory-set 158 MHz centre frequency and operates across 148 - 175 MHz after field tuning. Supplied with an MBC right-angle SO-239 roof-mount base (cable not included), 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.

Product Features:

• The antenna achieves a 3 dB gain improvement over a conventional quarter-wave whip by utilizing the Mopole ground-independent architecture and a lower radiation angle.
• It operates across a broad 148-175 MHz range with a tuned bandwidth of 4 MHz at 1.5:1 VSWR (8 MHz at 2.0:1) and can be field-tuned using the supplied chart.
• The patented end-fed matching circuit is encapsulated in a high-impact thermoplastic housing to maintain a consistent 50 Ω impedance and ensure long-term durability.
• The flexible, tapered stainless-steel whip resists corrosion, vibration, and repeated impacts, preserving signal integrity over time.
• The ground-independent design delivers full performance when mounted on gutters, mirrors, and other unconventional surfaces.
• An MBC right-angle SO-239 base is included for quick, secure roof-mount installation (coaxial cable is ordered separately).
• This antenna is designed, manufactured, and patented in Australia (AU #596830 & #656793) to withstand harsh local operating conditions.

Application Areas:

• It is ideal for fleet trucks, service vans, and logistics vehicles that require broadband VHF communications without a full roof ground plane.
• Public-safety and emergency-response units can mount it on mirrors, roof gutters, or trunk lips for rugged, reliable performance.
• Mining, construction, and agricultural machinery operating in vibration-prone, impact-intensive environments benefit from its durable construction.
• Urban delivery and rural logistics vehicles gain flexible mounting options to overcome space or clearance constraints.
• Marine and recreational off-road vehicles benefit from its corrosion-resistant, impact-tolerant stainless-steel whip.

In the Box:

• 1 x RFICD28-41-50-158 VHF Mopole Antenna Whip (158 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