Description
Why Choose the AC Antennas CX4-12?
The Marine VHF Antenna CX4-12 is a professional 1.14m fibreglass antenna designed for marine and land-based VHF communication systems. Covering 154–174 MHz, the CX4-12 features an N female connector, 3dB marine gain, 150W power handling and IP68 waterproof protection for demanding commercial and marine installations.
✓ N Female Connector
✓ 3dB Marine Gain
✓ 150W Power Rating
✓ Fibreglass Construction
✓ IP68 Waterproof
Marine VHF Antenna CX4-12 Overview
The Marine VHF Antenna CX4-12 from AC Antennas is a professional-grade omnidirectional VHF antenna designed for marine and land-based communication systems. Covering 154.0–174.0 MHz, it is suitable for commercial vessels, workboats, harbour systems, fleet communication and professional VHF installations.
The CX4-12 combines a compact 1.14m fibreglass design with an N female connector, 3dB marine gain, 150W maximum input power and IP68 ingress protection for reliable operation in harsh marine and outdoor environments.
Marine VHF Antenna CX4-12 Applications
- Commercial vessel VHF radio systems
- Workboat and offshore support communication systems
- Harbour, marina and fleet VHF installations
- Land-based VHF communication systems
- Professional installations requiring an N female connector
- Marine systems requiring extended 154–174 MHz coverage
- Replacement or retrofit VHF antenna installations
Extended 154–174 MHz VHF Coverage
The CX4-12 operates across a wider 154.0–174.0 MHz frequency range. This makes it useful for professional communication systems requiring wider VHF coverage while still using a rugged marine-grade antenna design.
For installations requiring standard marine VHF band coverage with an N female connector, see the Marine VHF Antenna CX4-6.
Built for Harsh Marine and Outdoor Environments
The CX4-12 is manufactured using premium materials to help prevent galvanic corrosion. The radiating elements are made from brass, and the antenna uses AC Antennas crimping technology for a stronger mechanical build-up.
With fibreglass construction, IP68 waterproof protection and a 200 km/h survival wind speed rating, the CX4-12 is suitable for exposed marine and land-based installations where long-term reliability matters.
Marine VHF Antenna Height and Range
Marine VHF range is strongly affected by antenna height, cable quality, installation position and surrounding obstructions. Mounting the antenna as high and clear as practical will usually improve line-of-sight communication performance.
For more detail, read our VHF Antenna Height vs Range Guide and Marine VHF Antenna Range guide.
Technical Specifications
- Product: CX4-12
- Part Number: 100014-T
- Product Group: VHF
- Design: Coaxial dipole
- Pattern: Omnidirectional
- Frequency Range: 154.0–174.0 MHz
- Bandwidth: 20 MHz
- Nominal Impedance: 50 Ohm
- Maximum Input Power: 150W
- Gain: 0 dBd / 2.15 dBi / 3dB marine gain
- VSWR: < 1.5:1
- Polarisation: Vertical
- DC Shorted: Yes
- DC Grounded: Yes
- Connector: N Female
- Length: 1.14m / 3.74ft
- Sections: 1
- Weight: 0.50kg / 1.10lbs
- Survival Wind Speed: 200 km/h / 55 m/s / 124 mph
- Wind Load at 160 km/h: 27N
- Material: Fibreglass
- Colour: White
- Operating Temperature Range: -55°C to +70°C
- Ingress Protection: IP68
- Thread: 1″ 14TPI male
Mounting Compatibility
The CX4-12 uses a standard 1″ 14TPI male marine antenna thread and is designed for compatible marine antenna mounts used across commercial, leisure and professional VHF installations.
For compatibility advice, see our Marine Antenna Thread Sizes Guide and Marine Antenna Mount Compatibility Guide.
Marine VHF Antenna Installation
For best performance, install the CX4-12 vertically and mount it as high and clear as practical. Avoid mounting close to large metal structures, radar scanners or other equipment that may affect VHF performance.
- Mount vertically for correct polarisation
- Use suitable marine-grade coaxial cable
- Keep cable runs protected and correctly routed
- Avoid crushed, damaged or sharply bent cable
- Seal external connectors correctly
- Inspect the antenna, mount and cable periodically
For more installation guidance, see our Marine VHF Antenna Mounting Guide.
Recommended Marine VHF Antenna Cable
Correct cable selection is important for VHF performance. Cable loss, water ingress and poor connector termination can reduce communication range even when the antenna is correctly specified.
Read our Marine VHF Antenna Cable Guide for cable selection advice.
CX4-12 vs CX4-11
The CX4-12 and CX4-11 both cover 154.0–174.0 MHz and both provide 3dB marine gain. The key difference is the connector type.
| Model | Frequency Range | Connector | Length |
|---|---|---|---|
| CX4-11 Marine VHF Antenna | 154.0–174.0 MHz | UHF Female | 1.26m |
| CX4-12 Marine VHF Antenna | 154.0–174.0 MHz | N Female | 1.14m |
Related Marine Communication Guides
- Marine VHF Antenna Information Guide
- 3dB vs 6dB Marine VHF Antennas
- Marine VHF Antenna Range
- VHF Antenna Height vs Range
- Marine VHF Antenna Cable Guide
- Marine VHF Antenna Mounting Guide
- Marine Antennas Explained
Downloads
Download CX4-12 Datasheet PDF
Frequently Asked Questions
What is the Marine VHF Antenna CX4-12 used for?
The CX4-12 is designed for marine and land-based VHF communication systems requiring 154–174 MHz coverage, 3dB marine gain and an N female connector.
What frequency range does the CX4-12 cover?
The CX4-12 covers 154.0–174.0 MHz.
What connector does the CX4-12 use?
The CX4-12 uses an N female connector.
What gain is the CX4-12 antenna?
The CX4-12 provides 0 dBd / 2.15 dBi gain, commonly expressed as 3dB marine gain.
How long is the CX4-12 antenna?
The CX4-12 is 1.14m / 3.74ft long.
Is the CX4-12 waterproof?
Yes. The CX4-12 has an IP68 ingress protection rating.
What is the difference between the CX4-12 and CX4-11?
Both antennas cover 154.0–174.0 MHz. The CX4-12 uses an N female connector, while the CX4-11 uses a UHF female connector.
Manufacturer Information
Manufactured by AC Antennas.
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