Description
KUM121 Active HF Antenna
KUM121 Active HF Antenna is a professional-grade active HF/SSB receive antenna designed for marine and land-based communications systems. Covering the full 0.15–30 MHz HF frequency range, the antenna includes an integrated low-noise amplifier for reliable reception of HF communications, weather fax broadcasts, NAVTEX services and maritime information transmissions.
Designed for Marine HF Communications
The AC Antennas KUM121 is engineered for professional marine communications applications where reliable HF signal reception is essential. Its omnidirectional design allows reception from all directions without antenna alignment, making it suitable for commercial vessels, fishing boats, workboats, offshore installations and shore-based communications facilities.
The integrated active amplifier improves received signal performance across the HF spectrum, supporting marine weather fax reception, HF radio monitoring, maritime safety broadcasts and long-range communications systems.
Why Choose an Active HF Antenna?
An active HF antenna is useful where a traditional long wire or large HF receiving antenna is not practical. Instead of relying only on physical antenna length, the KUM121 uses an integrated amplifier to support wideband HF reception across 0.15–30 MHz.
This makes the KUM121 well suited to vessels with limited mounting space, commercial bridge systems, shore-based monitoring points and marine installations where compact HF reception is required without installing a full-length HF wire antenna.
Built for Harsh Marine Environments
Manufactured using fibreglass and corrosion-resistant materials, the KUM121 is designed for continuous exposure to saltwater, UV and severe weather. AC Antennas uses copper radiating elements and crimping technology for a strong, durable construction suitable for professional marine use.
With IP68 waterproof protection and a survival wind speed of up to 200 km/h, the antenna is suitable for both commercial and leisure vessel installations.
Applications
- Marine HF communications systems
- HF/SSB radio monitoring stations
- Weather fax reception systems
- NAVTEX and maritime safety information reception
- Commercial vessel communications
- Offshore platforms and installations
- Coastal radio stations
- Government and maritime authority monitoring systems
- Land-based HF receiving installations
KUM121 Active HF Antenna Specifications
| Product Group | HF/SSB |
| Design | Active Receiving Antenna |
| Pattern | Omnidirectional |
| Frequency Range | 0.15–30 MHz |
| Bandwidth | 29.85 MHz |
| Input Power | Receive Only |
| Nominal Impedance | 50 Ohm |
| Supply Voltage | 9–12 VDC |
| Supply Current | 35 mA Maximum |
| Maximum Output | 10 dBm |
| IP3 | > +28 dBm |
| IP2 | > +50 dBm |
| Amplifier Noise Figure | 10 dB |
| Polarisation | Vertical |
| DC Shorted | No |
| DC Grounded | Yes. Galvanic isolation on DC supply is recommended. |
| Connector | UHF Female |
| Length | 1.26 m / 4.10 ft |
| Sections | 1 |
| Weight | 0.50 kg / 1.10 lbs |
| Survival Wind Speed | 200 km/h / 45 m/s / 124 mph |
| Material | Fibreglass |
| Colour | White |
| Operating Temperature | -40°C to +60°C |
| Ingress Protection | IP68 |
| Thread | 1" 14TPI Male / ISO 228/1-G1 Female |
| Mounting | Mounting Nut Included |
Frequently Asked Questions
Can the KUM121 transmit HF signals?
No. The KUM121 is a receive-only active HF antenna and must not be used for transmitting.
Is the KUM121 suitable for NAVTEX reception?
Yes. The KUM121 covers the relevant low and HF frequency ranges used by maritime information and monitoring services, making it suitable for NAVTEX-related receiving applications where system compatibility is confirmed.
Can the KUM121 be used on land?
Yes. The KUM121 is designed for both marine and land-based HF/SSB receiving installations.
Does the KUM121 require power?
Yes. The integrated amplifier requires a 9–12V DC supply with a maximum current draw of 35 mA.
What connector does the KUM121 use?
The KUM121 uses a UHF female connector.
Related HF & Marine Communications Guides
- Active HF Antenna for Boats
- What Is GMDSS and How Does It Work?
- What Is NAVTEX and How Does It Work?
- How to Install a NAVTEX Antenna
- Why Is My NAVTEX Reception Poor?
- Marine Antenna Thread Sizes
- Marine Antenna Mount Compatibility Guide
- Marine Electronics Knowledge Base
Related Products
- ICOM IC-M803 MF/HF Marine SSB Transceiver
- SAILOR 6320 MF/HF DSC Radio
- SAILOR 6311 MF/HF DSC Radio
- NAVTEX3E Active Receive Antenna
- MF/HF Antenna Wire Kit
External Resources
View More AC Antennas Products
For KUM121 Active HF Antenna supply or replacement enquiries, confirm the exact model or part reference against the equipment already installed. Installation requirements for the KUM121 Active HF Antenna should be checked against the vessel or shore-side system before ordering. F&C Marine can help confirm KUM121 Active HF Antenna compatibility where existing equipment details are available.
Related F&C Marine guide
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