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Call 0345 2300 599Sirio Boomerang W
A compact 1/4-wave ground-plane antenna for installations where a conventional full-length vertical simply won't fit, using helically wound fibreglass elements to reduce its physical size.
The Sirio Boomerang W is designed specifically for balcony, temporary and space-restricted installations. It provides the familiar Boomerang ground-plane arrangement while using shortened fibreglass elements rather than the much longer aluminium radiator found on the Boomerang A.
Both the main radiator and radial use helical loading, allowing Sirio to retain the antenna's 1/4-wave electrical design while reducing the overall physical size to approximately 2.18 metres.
Helically Wound Fibreglass Elements
The key difference between the Boomerang W and the conventional Boomerang A is the construction of the radiating element.
Instead of using a long aluminium whip, the W version uses a tapered fibreglass main radiator with an internal helical winding. The radial is also constructed from fibreglass with helical loading, substantially reducing the physical dimensions of the antenna while retaining its intended electrical operation.
Ideal for Balcony & Temporary Installations
Not every station has room for a full-sized vertical. The Boomerang W was specifically developed for situations where available space is limited, making it particularly useful for balconies, temporary stations and other installations where a conventional full-length radiator would be impractical.
The supplied mast bracket supports the main vertical radiator while the angled radial provides the antenna's counterpoise.
Tune the Main Radiator for Your Operating Frequency
The Boomerang W incorporates a fine-tuning system on the main radiator, allowing the resonant frequency to be adjusted more precisely for the intended operating frequency.
Final SWR adjustment can then be made by altering the inclination angle of the radial until the best match is achieved.
Set It Up with an SWR Meter
Quarter-Wave Ground-Plane Design
The Boomerang W is a 50-ohm, 1/4-wave ground-plane design with linear vertical polarisation and omnidirectional horizontal radiation. Sirio specifies a gain of 0 dBd / 2.15 dBi and bandwidth of at least 800kHz at SWR ≤2.
Lightweight, Strong & Weather Ready
Fibreglass, copper, steel and nylon construction keeps the Boomerang W relatively lightweight at approximately 750 g, while Sirio rates the antenna for wind speeds of up to 140 km/h.
For best performance, install the antenna clear of metal roofs, walls, power lines and other antennas, and use a good-quality 50-ohm coaxial feed cable kept as short as reasonably practical.
Sirio Boomerang Series Manual
The official Sirio manual includes the complete parts list, assembly diagram, mounting instructions, safety information and detailed tuning procedure for the Boomerang W.
View Manufacturer ManualSirio Boomerang W Technical Specifications
Compact helically loaded 1/4-wave ground-plane antenna for balcony and space-restricted installations.
| Product number | 2101115.00 |
|---|---|
| Type | 1/4 λ ground-plane boomerang |
| Frequency range | 26.8–27.6MHz, tunable |
| Impedance | 50 Ω |
| Radiation | Omnidirectional |
| Polarisation | Linear vertical |
| Gain | 0 dBd / 2.15 dBi |
| Bandwidth | ≥800kHz @ SWR ≤2 |
| SWR at resonance | ≤1.2 |
| Maximum power | 300W CW continuous / 900W CW short time |
| Connector | UHF female / SO-239 |
| Main radiator | Tapered fibreglass with helical winding |
| Radial | Fibreglass with helical winding |
| Overall height | Approx. 2180 mm / 7.15 ft |
| Radial length | Approx. 1280 mm |
| Weight | Approx. 750 g |
| Wind resistance | 140 km/h |
| Mounting | On mast, bracket supplied |
| Fine tuning | Adjustment system on main radiator, with final SWR adjustment by radial inclination |
Shipping & Delivery
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New Equipment Warranty
Minimum 2-Year Warranty
All new products supplied by ML&S carry a minimum two-year warranty against manufacturing defects, excluding batteries, which are covered by separate warranty terms.
Some manufacturers provide extended warranties, such as the three-year warranty available on eligible Yaesu equipment. Any additional coverage is subject to the manufacturer's terms and conditions.
Our workshop may assess and repair faulty equipment on site or refer it to the manufacturer or an authorised service centre where necessary.
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Unless otherwise stated, ML&S warranty servicing is carried out in the UK. International customers must contact us before returning goods to confirm shipping and customs requirements.
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