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Call 0345 2300 599The OptiBeam OB11-5 is a high-performance 11 element multiband HF Yagi covering the 20m, 17m, 15m, 12m, and 10m amateur bands.
Designed for serious fixed-station operators, the OB11-5 provides strong gain, good front-to-back performance, and low VSWR across five popular upper HF bands. With a 6.0m boom length, 11.04m maximum element length, and 6.3m turning radius, it offers an excellent balance of performance and manageable installation size.
The antenna uses a single 50 ohm coax feedline, helping to keep the installation straightforward while still providing effective multi-band directional HF performance.
Key Features
- 11 element multiband HF Yagi
- Covers 20m, 17m, 15m, 12m, and 10m
- 11 elements plus 6 hidden sleeves for 12m and 17m
- Strong gain across all supported bands
- Good front-to-back performance
- Low VSWR across the supported bands
- Single 50 ohm coax feedline
- 6.0m boom length
- 6.3m turning radius
- 11.04m maximum element length
- 45kg antenna weight
- Ideal for DXing, contesting, and fixed-station HF operation
- Suitable for permanent mast or tower installations
Band Performance
| Band | Gain dBd | Gain dBi | Front-to-Back Ratio |
|---|---|---|---|
| 20m | 5.3dBd | 12.7dBi | 22dB |
| 17m | 5.5dBd | 13.0dBi | 22dB |
| 15m | 5.6dBd | 13.2dBi | 20dB |
| 12m | 5.6dBd | 13.4dBi | 19dB |
| 10m | 6.7dBd | 14.5dBi | 19dB |
VSWR Performance
| Band | Frequency Points | VSWR |
| 20m | 14.00 / 14.19 / 14.35MHz | 1.3 / 1.0 / 1.2 |
| 17m | 18.07 / 18.14 / 18.17MHz | 1.3 / 1.1 / 1.2 |
| 15m | 21.00 / 21.25 / 21.45MHz | 1.5 / 1.1 / 1.5 |
| 12m | 24.89 / 24.93 / 24.99MHz | 1.2 / 1.1 / 1.3 |
| 10m | 28.00 / 28.50 / 29.00MHz | 1.5 / 1.1 / 1.5 |
Specifications
| Specification | Details |
| Brand | OptiBeam |
| Model | OB11-5 |
| Product type | 11 element 5 band HF Yagi |
| Antenna type | Directional antenna |
| Design | Yagi |
| Supported bands | 20m / 17m / 15m / 12m / 10m |
| Number of elements | 11, plus 6 hidden sleeves for 12m and 17m |
| Active elements | 3 / 3 / 3 / 3 / 5 |
| Feedline | 1 x 50 ohm coax |
| Maximum element length | 11.04m |
| Boom length | 6.0m |
| Turning radius | 6.3m |
| Wind load at 130km/h | 1,171N |
| Wind surface area | 1.47 sq m / 15.8 sq ft |
| Weight | 45kg |
Typical Uses
- Fixed-station HF operation
- 20m to 10m DXing
- HF contesting
- Upper HF beam installations
- WARC band operation on 17m and 12m
- Operators wanting strong five-band directional performance
- Permanent mast or tower installations
- Stations needing a serious but manageable multiband HF beam
Installation Notes
The OB11-5 is designed for fixed installation on a suitable mast or tower. Please ensure that your mast, tower, rotator, mounting hardware, and support structure are suitable for the antenna’s size, weight, turning radius, maximum element length, and wind load.
As with any HF Yagi, final performance will depend on installation height, surrounding structures, feedline quality, grounding, and correct assembly.
Important Note
This listing is for the OptiBeam OB11-5 antenna only. Mast, rotator, coaxial cable, mounting hardware, and other station accessories are not included unless stated otherwise.
Please check that your installation site, rotator, and support structure are suitable before ordering.
Shipping:
We have several shipping options for our products, including next-day and Saturday/Sunday delivery for certain items. Please see these options at checkout.
Returns:
If you have any equipment that needs to be returned to Martin Lynch & Sons, please fill out the form below:
Upon receipt of goods you have 14 days to return goods however the goods must be returned in original packaging and care must have been taken with the goods you wish to return. Under distance selling regulations you are not entitled to any refund on carriage charges or modification charges made at your request. Large items cannot be returned if they have been assembled, unless faulty.
Warranty Terms and Conditions
Outside of the 14 faulty return period, returned items cannot be accepted, unless covered by manufacturer's warranty. We will repair as much as possible on site however in exceptional circumstances products may have to be returned to the manufacturer of distributor.
For repairs/replacements under manufacturer’s warranty for any item please download a ML&S return form from the link above and return to ML&S with the faulty product.
International Warranty information
Warranty service for items we sell is available in the U.K. only, unless otherwise noted. It is your responsibility to pay freight for returned items to the U.K. and back to you for desired warranty coverage. All of our NEW products come with a minimum 12 month warranty, (Yaesu & Icom 24 months), with up to 90 days on second-hand equipment. Items returned for service must state "returned goods for repair" on the return air waybill or U.K. import customs duties apply and will be added to your invoice. For more info about returning items please contact our customer help desk, [email protected]