AC-118-400

High-Performance VHF/UHF Air Band Omni Antenna AC-118-400

The AC-118-400 is a professional-grade, ruggedized omni-directional antenna specifically engineered for the demanding requirements of the 118–400 MHz aviation band. Designed to support seamless ground-to-ground and ground-to-air communications, this antenna eliminates the need for multiple installations by covering the entire VHF and UHF spectrum in a single, compact unit. Whether deployed at Air Traffic Control (ATC) sites or in harsh coastal and desert environments, its all-weather ABS radome and corrosion-resistant 6063T6 aluminum alloy construction ensure peak performance where reliability is non-negotiable.

AC-118-400: High-Performance VHF/UHF Aviation Band Omni Antenna

The AC-118-400 is a professional-grade, wideband omni-directional antenna designed for the demanding requirements of Air Traffic Control (ATC) and aviation communication. Operating across the full 118-400 MHz spectrum, it provides a unified solution for ground-to-air and ground-to-ground radio links, eliminating the need for multiple narrow-band antennas.

Design Excellence of V/UHF ATC Omni Antenna 

The design of the AC-118-400 focuses on aerodynamic efficiency and electrical stability. Featuring a coaxial dipole architecture, it maintains a clean elevation radiation pattern without the downward tilt typically seen in discone antennas. The internal radiating elements are protected by a high-strength ABS radome, designed to minimize wind loading and prevent ice accumulation. This compact, ruggedized design ensures that the antenna remains operational in the most extreme climates, from salt-heavy coastal regions to high-heat desert environments.

Precision Fabrication VHF UHF Aeronautical Band Omni

Fabricated using 6063T6 architectural-grade aluminum alloy and high-grade stainless steel, the AC-118-400 is built for longevity. The manufacturing process involves a specialized impedance matching technique to ensure a smooth VSWR across the entire frequency range. All metallic surfaces are finished with a military-grade olive green powder coating, providing a barrier against UV radiation, acid rain, and corrosive gases. The assembly is designed for rapid deployment, allowing for full setup in under two minutes via a secure stainless steel stud system.

Optimized Performance of ATC Antenna

In terms of performance, this antenna delivers a consistent 2 dBi gain and a wide vertical beam-width of 80 degrees, ensuring reliable signal coverage even when aircraft are at varying altitudes. With a power handling capacity of up to 500 Watts (scalable to 1KW) and a VSWR better than 2:1, it provides a stable interface for high-power transmitters. The vertical polarization and omni-directional pattern make it the ideal choice for mission-critical ATC sites requiring 360-degree situational communication.

Key Technical Features

• Wideband Performance: Full coverage of the 118-400 MHz range without the need for field tuning or manual adjustments.
• High Power Capacity: Standard handling of 500 Watts, with an optional upgrade to 1KW for high-power broadcast requirements.
• Optimized Radiation: Features a constant 80-degree vertical beam-width and a clean elevation pattern, superior to traditional discone antennas.
• Rugged Construction: Radiating elements are protected within a high-strength, RF-transparent ABS radome for maximum durability.
• Environmental Resilience: All metallic parts are finished with a specialized powder coating to resist salt spray, acid rain, and UV radiation.
• Ease of Installation: Lightweight design (6kg) with a stainless steel stud system that allows for full assembly in under 2 minutes.
• Internal Feed System: The N-Female termination and feed cable are enclosed within the mounting pipe, providing 360-degree weatherproofing.

Global Compliance & Quality Standards

The AC-118-400 is manufactured to meet the world’s most stringent military and industrial regulatory frameworks:

• MIL-STD Compliance: Fully tested and certified under MIL-STD-810G for High/Low Temperature, Humidity, Shock, Vibration, Rain, Fungus Resistance, and Salt Fog.
• CE Certified: Meets all European Union health, safety, and environmental protection standards for electronic equipment.
• RoHS Compliant: Constructed without the use of hazardous substances (Restriction of Hazardous Substances), ensuring eco-friendly operation.
• WEEE Directive: Fully compliant with Waste Electrical and Electronic Equipment regulations for responsible end-of-life recycling.

Key Advantages of the AC-118-400

1. Unified Solution: Replaces multiple antennas with one wideband unit, reducing mast loading and installation costs.
2. Stable Gain: Maintains a consistent 2 dBi gain across the entire frequency spectrum for reliable signal strength.
3. Low Maintenance: The "set and forget" design requires no periodic tuning, even in extreme weather conditions.
4. Superior Pattern Stability: Unlike discone antennas that tilt downward at higher frequencies, this coaxial dipole design maintains a stable, horizontal radiation pattern.

Primary Antenna Applications

• Air Traffic Control (ATC): Primary communication link for civil and military aviation towers.
• Ground-to-Air Communications: Reliable link for airports, helipads, and remote flight service stations.
• Coastal & Marine: Ideal for maritime aviation support due to its salt-spray resistant powder coating.
• Military Operations: Deployable in desert or arctic environments thanks to its MIL-SPEC ruggedization and olive green finish.