Sirio CX-4-73 – VHF Band Base Antenna (Taxi/PMR Antenna)


The Sirio CX-4-73 is a base antenna, this one is designed to work between 73 and 78 MHz.


3/4 λ VHF antenna for base station service made of high-quality materials to get the best performance and maximum efficiency. It is completely manufactured with aluminium tubes and nylon for its great robustness and it is supplied with a solid steel bracket for an easy and safe installation. Its Gamma Match feed makes it earthed for perfect protection against static discharges. Simple and strong, it is particularly recommended for professional use.

Key Features:

  • Low-gain, Omnidirectional
  • Base station antenna, Mono-band
  • Made of aluminium alloy 6063 T-832
  • Protection from static discharges DC-Ground


Electrical Data Mechanical Data
Type: 3/4 λ coaxial J-pole Materials: Aluminium, Brass, Stainless Steel, Nylon
Impedance: 50Ω Dimensions (approx): From 2700 to 3360 mm
Radiation (H-plane): 360° omnidirectional Weight (approx): 1900 g
Radiation (E-plane): Beamwidth -3 dB = 60° Mounting Mast: Ø 35-42 mm
Radiation Angle: 3° Wind Load: 97 N 150 km/h
Frequency Range: Tunable 78-83 MHz Resistance: 150 km/h
Polarization: Linear vertical Wind Surface: 0.08 m²
Gain: 2 dBd – 4.15 dBi
Bandwidth SWR ≤1.5: CX 4-73: ≥ 2.0 MHz 73 MHz
Max Power (CW) 30°C: 500 watts
Grounding Protection: All metal parts are DC-grounded, and the inner conductor shows a DC short
Connector: UHF-female



Additional information

Weight 10 kg