Sirio CX-4-73 VHF Band Base Antenna


Elevate your VHF communication with the Sirio CX-4-73 Base Antenna, designed for 73-78 MHz frequencies. This robust mono-band antenna features a 3/4λ coaxial J-pole design, offering a 360° omni-directional radiation pattern and a gain of 2dBd – 4.15 dBi.


Sirio CX-4-73 VHF Band Base Antenna

Introducing the Sirio CX-4-73 VHF Band Base Antenna, a premier solution tailored for the 73-78 MHz frequency range, designed to elevate your communication capabilities. Engineered for reliability and performance, the Sirio CX-4-73 stands out as an essential tool for enthusiasts and professionals alike.

Key Features

  • Type: Base station antenna, Mono-band.
  • Design: 3/4λ coaxial J-pole, offering excellent omni-directional characteristics.
  • Frequency Range: Easily tunable from 73 MHz to 78 MHz, ensuring versatility and superior tuning.
  • Gain: 2dBd – 4.15 dBi, enhancing signal reception and transmission.
  • Build Quality: Constructed from robust aluminium alloy 6063 T-832, designed to withstand the elements.

Performance Specifications

  • Impedance: Standard 50Ω, maintaining effective signal transfer.
  • Radiation Properties:
    • H-plane: 360° omni-directional, maximizing area coverage.
    • E-plane: Beamwidth at -3 dB = 60°, focusing the signal for improved reach.
    • Radiation Angle: Sharp 3°, minimizing ground wave loss and enhancing directivity.
  • Polarization: Linear vertical, ideal for achieving clear signal paths.
  • Bandwidth: ≥ 2.0 MHz @ 73 MHz with an SWR ≤1.5, providing broad frequency coverage.
  • SWR: ≤ 1.2 at resonance frequency, ensuring efficient operation.

Durability and Protection

  • Materials: High-quality combination of Aluminium, Brass, Stainless Steel, and Nylon.
  • Wind Resistance: Capable of withstanding wind speeds up to 150 Km/h, thanks to a wind load rating of 97 N and a minimal wind surface of 0.08 m².
  • Protection: Features DC-grounding, safeguarding against static discharges and ensuring all metal parts are protected.

Installation and Dimensions

  • Height: Adjustable from 2700 to 3360 mm, adaptable to various setups.
  • Weight: Approximately 1900 gr, ensuring stability yet manageable for mounting.
  • Mounting: Compatible with masts Ø 35-42 mm, facilitating a straightforward setup process.
  • Connector: Equipped with a reliable UHF-female connector for secure connections.

Ideal For

The Sirio CX-4-73 is perfect for radio amateurs and commercial users who demand a low-gain, high-quality antenna with exceptional build and reliable performance. Whether for base station operations or field setups, this antenna offers the versatility and robustness needed to handle diverse communication demands.

Enhance your communication setup with the Sirio CX-4-73 VHF Band Base Antenna, where functionality meets performance in a sleek, durable package. Perfect for those who require reliability without compromise.

Additional information

Weight 5 kg