Sirio Signal Keeper - Radioworld UK
Sirio Signal Keeper - Radioworld UK
Omnidirectional base station CB antenna by Sirio, tuned for 26–28MHz with 2.15dBi gain
Sirio Signal Keeper CB antenna with 1/4 wave ground plane and UHF-female connector
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Sirio Signal Keeper - Radioworld UK
Omnidirectional base station CB antenna by Sirio, tuned for 26–28MHz with 2.15dBi gain
Sirio Signal Keeper CB antenna with 1/4 wave ground plane and UHF-female connector

Sirio Antennas – CB, Amateur & Professional Radio Solutions

Sirio Signal Keeper Base Station Antenna | Radioworld UK

£0.00
(£0.00 exc. VAT)
£49.96
(£41.63 exc. VAT) + £5.00
Please note that there is an extra charge for deliveries exceeding 1.0 meter.
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Product code: 11-628
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Item CostFinance OptionDepositMonthly PaymentsTotal Cost
£49.96
12 Months 14.9% APR
£5.00
£4.30
£56.66
£49.96
18 Months 14.9% APR
£5.00
£2.87
£56.66
£49.96
24 Months 14.9% APR
£5.00
£2.15
£56.66
£49.96
36 Months 14.9% APR
£5.00
£1.43
£56.66
£49.96
48 Months 14.9% APR
£5.00
£1.08
£56.66
£49.96
12 Months 19.5% APR
£5.00
£4.48
£58.72
£49.96
18 Months 19.5% APR
£5.00
£2.98
£58.72
£49.96
24 Months 19.5% APR
£5.00
£2.24
£58.72
£49.96
36 Months 19.5% APR
£5.00
£1.49
£58.72
£49.96
48 Months 19.5% APR
£5.00
£1.12
£58.72

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Sirio Signal Keeper - Radioworld UK

Sirio Signal Keeper Base Station Antenna | Radioworld UK


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The Sirio Signal Keeper is a durable omnidirectional base station antenna, factory‑tuned for mid‑band performance. Built from aluminium alloy 6063 T832, it offers long‑lasting resistance to weather and corrosion. With optional FT‑2 side-mast mounting, it offers flexible installation for CB and amateur radio users.

Electrically, the Signal Keeper is a ¼ λ base‑loaded ground plane antenna with a 360° omnidirectional radiation pattern, ensuring reliable coverage across the 26–28 MHz band. Compact yet efficient, it delivers dependable communication for base station setups.


Technical Specifications

Electrical Data:

  • Type: ¼ λ base‑loaded ground plane

  • Frequency Range: 26 – 28 MHz

  • Impedance: 50 Ω

  • Radiation Pattern: 360° omnidirectional (H‑plane)

  • Polarization: Linear vertical

  • Gain: 0 dBd / 2.15 dBi

  • Bandwidth: ≥ 850 KHz at SWR ≤ 2

  • SWR: ≤ 1.2 at resonant frequency

  • Max Power: 100 W (CW continuous), 300 W (CW short time)

  • Feed System: Direct/centre feed

  • Connector: UHF‑female

Mechanical Data:

  • Materials: Aluminium, steel, nylon

  • Height: 2370 mm

  • Weight: 640 g

  • Radial Length: 640 mm

  • Wind Resistance: 36 N at 150 km/h / 130 km/h

  • Wind Surface Area: 0.03 m²

  • Mast Diameter: Ø 35–40 mm

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