Sirio CX-4-68 Base Antenna



The Sirio CX-4-68 is a 4m band base antenna, designed to work between 68 and 73 MHz.

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

 Electrical Features: 

  • Type: 3/4λ coaxial J-pole. 
  • Frequency range: CX 4-68: tunable 68-73MHz, CX 4-73: tunable 73-78MHz, CX 4-78: tunable 78-83MHz, CX 4-83: tunable 83-88MHz.  
  • Impedance: 50Ohm. 
  • Radiation (H-plane): 360° omnidirectiona  
  • Radiation (E-plane): beamwidth @ -3 dB = 60°. 
  • Radiation angle: 3°. 
  • Polarization: linear vertical.  
  • Gain: 2dBd - 4.15 dBi. 
  • Bandwidth @ SWR 1.5: CX 4-68: 1.7MHz - 68MHz, CX 4-73: 2.0MHz - 73MHz, CX 4-78: 2.5MHz - 78MHz, CX 4-83: 2.5MHz - 83MHz.  
  • SWR: 1.2.
  • Max Power (CW) 30°C: 500W.
  • Grounding protection: All metal parts are DC-grounded, the inner conductor shows a DC short.  
  • Connector: UHF-female.
Mechanical Features: 
  • Materials: Aluminium, Brass, Stainless Steel, Nylon.
  • Wind load / resistance: 97 N -150 Km/h /150 Km/h.
  • Wind surface: 0.08 m².  
  • Height (approx.): from 2700 to 3360mm. 
  • Weight (approx.): 1900g. 
  • Mounting mast: 35-42mm.

(Please note due to sizing of antenna's postage may change).




We accept PayPal, Debit/Credit Cards, Postal Orders (UK), Personal Cheques (UK), and Bank Transfers (please allow 5-7 days to complete - for overseas buyers). We don't take payments over the phone. Should you wish to make a debit/credit card payment please pay as a PayPal guest user. Simply click on the link to pay by PayPal. You will see the PayPal payment page, just look for the "Don't have a PayPal account?" link for credit card payments. You don't need to have a PayPal account for that.


Buying multiple items


We always offer combined postage. Simply confirm each item but do not checkout. After you have confirmed the final item then just click on the "Request a total from seller" link. We will then email you the best possible shipping discounted invoice.




We would appreciate it if you would contact us to inform of any problems BEFORE leaving negative or neutral feedback. We will try our best to answer any questions or resolve any problems that may occur.




If for any reason you are not completely satisfied with your purchase you may return it for a full refund of the item price within 7 days of receipt. The item must be in as sold condition, in its original packaging. Before returning please contact us through eBay messaging so we can expect delivery. Also please send a note with your return, this will make it easier for us to deal with the return quickly. All postage and packaging charges are non refundable unless the item is faulty or wrong item sent.

Our Brands