This is the Sirio CX-4-68 Amateur Radio Base Antenna for use on the 70MHz 4 metre amateur radio band.
In our humble opinion, there are few antennas for 4m amateur radio base station use that are anywhere near comparable for both performance and price.
In a recent review this antenna was compared to the Watson WVB-70 half-wave, and as well as outperforming the Watson by 2 S points, the Sirio was commended for it's excellent build quality - unlike the Watson.
Type: 3/4λ coaxial J-pole
• Frequency range CX 4-68 : 68-73 MHz tunable by diagram
• Impedance: 50Ω
• Radiation (H-plane): 360° omnidirectional
• Radiation (E-plane): beamwidth at -3 dB = 60°
• Radiation angle: 3°
• Polarization: vertical
• Gain: 2dBd - 4.15 dBi
• Bandwidth @ SWR 1.5:
CX 4-68: ≥ 1.7 MHz @ 68 MHz
• SWR. @ res. freq.: ≤ 1.2
• Max. power: 500 Watts
• Feed system / position: gamma match / base
• Connection: UHF-female
Mechanical Data
• Materials: Aluminium, Brass, Stainless Steel, Nylon
• Wind load / resistance: 97 N at 150 Km/h / 150 Km/h
• Wind surface: 0.08 m²
• Height (approx.): from 2720 to 3325 mm
• Weight (approx.): 1900 gr
• Mounting mast: Ø 35-42 mm
