The RFI CD28-41-53-171 VHF Mopole Antenna is factory-tuned to 171 MHz and delivers a true 3 dB gain in a ground-independent, no-tune design. Supplied with an MBC right-angle SO-239 roof-mount base and a 5 m low-loss coaxial cable (unterminated), the antenna installs easily on gutters, mirrors, trunk lips, or other space-restricted mounting points. A patented matching circuit sealed in a virtually indestructible thermoplastic body and a flexible 17-7 PH stainless-steel whip provide long-lasting, reliable service for fleet, public-safety, and industrial vehicles.

Product Features:

• The 3 dB gain improvement over a conventional ¼-wave whip enhances signal strength and clarity.
• Ground-independent performance allows dependable operation on gutters, mirrors, roof rails, or trunk mounts where a ground plane is absent.
• It offers broad 148 - 175 MHz coverage with 4 MHz at 1.5:1 VSWR (8 MHz at 2:1) and is field-tuneable using the supplied chart for minimum VSWR.
• The patented end-fed matching circuit, embedded in a high-impact thermoplastic housing, ensures consistent 50 Ω impedance and exceptional durability.
• The flexible, tapered stainless-steel whip with tough black powder coating withstands corrosion, vibration, and low-clearance impacts.
• The MBC right-angle SO-239 base is pre-assembled to a 5 m low-loss coaxial cable (connector not included) for quick custom termination in the field.
• It is Australian designed, manufactured, and patented (AU #596830 & #656793) for dependable operation in harsh environments.

Application Areas:

• These antennas are ideal for fleet trucks, service vans, and logistics vehicles that require strong VHF coverage without a full roof ground plane.
• They are suitable for public-safety, fire, and EMS units needing rugged antennas for mounting on mirrors, roof gutters, or trunk lips.
• They perform reliably on mining, construction, and agricultural machinery operating in vibration-prone, impact-intensive environments.
• They benefit urban delivery and rural logistics vehicles were overhead obstructions limit antenna height.
• They are well-suited for marine and recreational off-road vehicles that require corrosion-resistant, impact-tolerant whips and ground-independent operation.

In the Box:

• 1 x RFICD28-41-53-171 VHF Mopole Antenna Whip (171 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