Sirio sy-4 4 element 27 mhz cb base antenna.
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Sirio Antennas

Sirio SY-4 is a 4-element 27 MHz CB base antenna known for its high performance and reliability.

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Product code: SIR-SY27-4
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Item CostFinance OptionDepositMonthly PaymentsTotal Cost
£149.95
12 Months 14.9% APR
£15.00
£12.92
£170.06
£149.95
18 Months 14.9% APR
£15.00
£8.61
£170.06
£149.95
24 Months 14.9% APR
£15.00
£6.46
£170.06
£149.95
36 Months 14.9% APR
£15.00
£4.31
£170.06
£149.95
48 Months 14.9% APR
£15.00
£3.23
£170.06
£149.95
12 Months 19.5% APR
£15.00
£13.44
£176.27
£149.95
18 Months 19.5% APR
£15.00
£8.96
£176.27
£149.95
24 Months 19.5% APR
£15.00
£6.72
£176.27
£149.95
36 Months 19.5% APR
£15.00
£4.48
£176.27
£149.95
48 Months 19.5% APR
£15.00
£3.36
£176.27

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Sirio sy-4 4 element 27 mhz cb base antenna.

Sirio SY-4 is a 4-element 27 MHz CB base antenna known for its high performance and reliability.


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The Sirio SY 27-4 is a 4-element Yagi (beam) antenna designed to cover the frequency range of 26.9 - 29.5 MHz. This directional antenna boasts high-gain properties with horizontal polarization and is factory-tuned at the 11-meter mid-band. It is constructed with high-quality materials including aluminium alloy 6063 T-832 and features elements equipped with waterproof jointing sleeves.

In terms of electrical data, the Sirio SY 27-4 offers an adjustable frequency range of 26.9-27.5 MHz up to 29.50 MHz with an impedance of 50 Ohm unbalanced. It provides a gain of 11 dBd and 13.15 dBi, with the potential to reach 14 dBi when mounted at 60 feet. The antenna has a bandwidth of 600 KHz at S.W.R. 2:1 and a low S.W.R. of = 1.2:1 at the resonant frequency, making it suitable for high-power applications up to 1000 Watts (CW) continuous.

Constructed with a combination of aluminum, steel, and nylon, the Sirio SY 27-4 is built to withstand harsh weather conditions. It has a wind load of 80N at 150 Km/h, wind resistance up to 120 Km/h, and a wind surface area of 0.07 m2. With dimensions of approximately 5725 x 4030 x 100mm, a boom length of 4030mm, and a maximum element length of 5725mm, this antenna offers a high-performance solution for long-range communication.

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