Converting an omnidirectional antenna into a directional one

The WD2250M-CR  is a corner reflector accessory which provides a  completely new approach to convert an omnidirectional antenna into a directional one through a simple add-on.  This innovative antenna is a quick add-on for existing dipole installations like the COJOT WD2250M. The WD2250M-CR comes in a handy carry-on bag (picture 1) and can be quickly assembled (picture 2) for use on existing systems (picture 3).

The WD2250M-CR offers

  • Antenna gain of 8-10 dBi
  • An easy to use pointing and locking mechanism
  • Usability with the COJOT Multi use antenna concept and respective models

When you need the highest efficiency in IED Countermeasures, choose our enhanced Counter RCIED Antennas

COJOT’s comprehensive range of mobile and fixed-site antennas for the range from 20 – 6000 MHz are a crucial element of today’s demanding RF systems.

Thanks to the enhanced technical specifications of higher power ratings and wider frequency ranges, combined with the use of new and innovative materials that provide enhanced mechanical properties COJOT vehicle and portable antennas are a perfect match for powerful IED Countermeasures.

Latest vehicle antenna design updates feature a new mounting flange that is made of lightweight, rust free composite material.

Some COJOT portable antennas feature a shock absorption spring that is made of rubber instead of steel. The beneficial characteristic of this type of shock absorption spring is that it makes the antenna up to 30 % lighter and better attenuates oscillation of the antenna.








Contact us to find out more about these and other antennas.

COJOT Steps Forward into Growth

’Success breeds success which requires that we position ourselves in the best possible way for further growth’ says Samu Lentonen, managing director of COJOT.

A proud supplier of antenna solutions for over 35 years, COJOT successfully continues to strengthen its role as a recognized and trusted partner for the supply, design and development of sophisticated SMART antennas, cutting-edge omnidirectional VHF/UHF/SHF wideband antennas and accessories for mobile and tactical communication, electronic counter measure and spectrum monitoring applications.

‘To meet the rising demand for COJOT products, we have increased the infrastructure capacity of our head office in Espoo, Finland. Our new larger facilities and state of the art equipment will support high quality and improved RF services, giving our customers in the global defence market the assurance they need that we can meet their demands stated Samu.

If you are planning to visit COJOT soon, this is what you can expect to see:

  • New modern collaborative workspaces and meeting rooms:
  • New, enlarged lab facilities and cutting-edge instrumentation:
    • RF-Lab:
      • New anechoic chamber:
        • Frequency range: 500-8000 MHz
        • Chamber size: 4 x 6 m (Measurement distance: 3 m)
      • Open air measurement track
        • Frequency range: 20-600 MHz
        • Measurement distance: 60 m
      • New accelerated high-power computing (HPC) unit for CST simulations
      • New measurement and prototyping tools like VNA and microscope
      • New automated Matlab-based Measurement software for R&D and Production: Depending on the measurement setup, the COJOT team is now able to measure products about 60-70 times faster per frequency.

    • HW-lab:
      • Own environmental test lab for testing and analyzing according to MIL-STD-810G
      • Temperature and humidity test chamber
      • Immersion tank (size 3 x 0.7 m)
      • UV test chamber
      • Vibration table
      • Oak Beam track
    • Upgraded protoshop.


Above : Protoshop

Above : New offices

Next generation SBAs from COJOT increase performance and usability

Following the great success of the SBA product family, COJOT Finland have enhanced their Switched Beam Antennas to provide improved performance, better system integration and usability.

The most important interface enhancement is the support for Ethernet based control. In addition, the RS-485  is enhanced to support up to 50MB/s communication speed.

Hardware enhancements include better shock and vibration resistance proven by rigorous testing.  The new mechanical platform has been analyzed for various ENV requirements without sustaining any loss of function or degradation of performance and supports options for additional peripherals like GPS antennas, 3D gyroscope, accelerometer and magnetometer

In addition to fixed-site installations like masts or shelters,  these mechanical enhancements also enable support for

  • Vehicular mounting
  • Naval vessel installation applications.

The usability is enhanced e.g. by clear markings that for example indicate beam zero direction for better antenna alignment.

To find out more about SBAs, watch this video.


SBA2458DB                                    SBA2458DB Interface showing enhanced markings


Our high gain omni antennas are portable and can be used on vehicles and manpacks.

High gain omni antennas are perfect in situations where  the direction of a receiving antenna is not static or known . These antennas can be used on vehicle and portable platforms for various applications, including jamming and tactical communications.

COJOT’s high gain omni antennas covers amongst others, NATO Band I, GSM, 3G, 4G and LTE frequency bands.  We have a wide, comprehensive range, some of which we have discussed below. Please visit our website for our full range.

The HD2245M, with a power rating of 75 or 100 W, is a high gain NATO antenna that does not require a ground plane for proper operation with ideal performance in the 225 – 450 MHz frequency range which makes it highly suited for tactical communication radios operating in NATO Band I.

Our NATO Band I, III and IV antennas are used in various tactical communications scenarios where the requirement is to adapt efficiently to ever changing needs. These antennas are suitable for the military manpack, handheld and vehicle segment, including fixed-site installations such as masts or shelters.  If you wish to find out more, view our video.

The HD2400Q is a high performance manpack antenna that is particularly suited for portable communication and jamming systems used in the S-band. It provides high gain over the entire 2100 – 2500 MHz frequency range

The HD4050M is a high gain dipole vehicle antenna that does not require a ground plane for proper operation. It’s ideal performance in the 400 – 500 MHz frequency range and high power rating make it very well suited for jamming applications.

  • We also have a manpack antenna with similar specifications. Our HD4050Q has a center fed design which minimizes interference of the human body on the radiation performance of the antenna.

The HD36M is a compact vehicle antenna that provides excellent performance over a very wide frequency band. This high-gain omnidirectional antenna comes with a steel shock absorption spring, which makes the HD36M well suited for various applications.

  • Similarly, the HD36 which is a compact manpack version of the HD36M and provides up to +7 dBi (typical horizontal gain)

The HD827XM is a high gain, high power 4G antenna covering the GSM, 3G and 4G LTE bands. The antenna is particularly suited for vehicle based high power jamming applications.

Click on each product to view more about this special group of antennas.  Find us at or at for more information.

We have improved the functionality of our whip antennas

At COJOT, we continuously explore ways of making our antennas superior and best in class to help our customers amplify their offer to the market.

Our world class whip antennas have been upgraded with a new and improved whip removal system.  We have replaced the old mounting screws with a thumb screw that allows the user to remove and re-attach the antenna whip without the aid of tools.

Our rugged, low profile, high-performance wide band vehicle antennas upgraded with this latest improvement are

  • The WB20140M  which is a rugged low-profile wideband antenna for communication and jamming applications in the 20 – 140 MHz frequency range and is used on various vehicles types.
  • The WB20CM is a low-profile wideband compact VHF antenna for vehicle based communication and jamming applications in the 20 – 140 MHz frequency range
  • The C30512M is a rugged, low profile and high-performance vehicle antenna providing maximum performance for modern tactical radios.
  • C30512M GPS is a VHF/UHF Vehicular C3I Antenna (with option for GPS)
  • The WB3090M is a rugged, low profile vehicle antenna that is ideally suited for mobile C3i applications in the 30 – 110 MHz frequency range  and is also used on almost all vehicle types.
  • The WB30512M is a rugged, high-performance VHF/UHF vehicle antenna for use in jamming and communications applications within the 20 – 520 MHz frequency range.
  • The WB30512XM is a high-power VHF/UHF vehicleantenna that has been designed for Counter-RCIED and jamming applications within the 20 – 520 MHz frequency range.

 This change has been verified against the electrical and environment requirements of the original design and has proven to comply with all requirements.  Electrical performance is not affected by this change.

To find out more about our upgrades, click on each product name to visit the webpages.


Ultra wideband dual port antenna 20-6000MHz

When solid coverage in RF systems is crucial, COJOT has the answer. Our wideband vehicle antennas for the range from 20 – 6000 MHz are a crucial element of today’s demanding RF systems that are used in tactical communication, electronic countermeasure (ECM) and spectrum monitoring applications. Due to their ruggedized nature COJOT vehicle antennas are an ideal choice for installations on all kind of vehicles as well as for fixed installations like on masts, shelters or containers.

The WBC2600M is a highly robust wideband dual port antenna effectively covering the VHF, UHF  and SHF bands. It is well suited for high power electronic countermeasure and tactical communication applications, especially where a multiple antenna set-up is not possible, or antenna co-location problems may occur

This antenna has been developed to provide a more cost-effective dual port ultra wideband solution with enhanced robustness and improved lead time requirements.

  • Two antennas integrated in the same mechanics
  • High band, ground plane independent antenna positioned at the top for optimum coverage
  • High power rating, more than 300 W in total

Looking for a stationary/semi mobile version?  Look no further than the WBC2600B.

The WBC2600B is a stationary dual port antenna that effectively covers the VHF, UHF and SHF bands and is  ideally suited for semi-mobile and fixed-site systems used in ECM, communication and monitoring applications.

In combination with the optionally available mast mount element (e.g. MS256)
the antenna can also be fully employed as a self-standing antenna on the ground or on a tubular mast.

Contact us at for more information.

Land Forces

COJOT products exhibited at Land Forces 2021 in Brisbane Australia

LAND FORCES 2021 is a premier international land defence exposition, showcasing equipment, technology and services for the armies of Australia and the Indo-Asia-Pacific.

Rojone, a partner to COJOT will be exhibiting at this year’s Land Forces exhibition.  They will showcase a range of cojot handheld antennas as well as our SBA4450B.

The SBA4450B is a switched beam antenna for the 4400 to 5000 MHz frequency band (UHF band IV). The antenna beam can be switched by remote control to achieve optimal gain to the desired direction and to avoid interference from unwanted directions. The antenna provides up to 20 sharp beams with a minimum of 20-degree beam width to cover the full 360-degree horizontal area. In addition to these sharp beams the antenna can also provide wider beams. The antenna provides superior gain performance with low side lobe levels. Its extremely fast beam switching ability makes the antenna suitable for complex node network in tactical communication.

Multi use high performance

Multi Use High Performance Dipole Antennas

COJOT has produced multi use high performance dipole antennas where the same radiator can be used for both vehicle and mast mounting.

The WD30512M and the WD30512M-B support the multi use concept. These  antennas work in the  30 – 512 MHz frequency range. Some features of these antennas are:

  • Dipole antenna – no ground plane required
  • Detachable radiator elements – without the need for tools
  • Multi-use concept allows quick & easy mounting to different platforms

If you want to find out more about COJOT’s multi-use concept, read our white paper here.

COJOT is part of the Alaris Holdings Group of Companies.

Linwave Technology

Alaris Holdings Purchases UK based Linwave Technology

South African based Alaris Holdings has long been on the lookout for opportunities to widen its already substantial footprint, which has resulted in the acquisition of UK based Linwave Technology. A specialist in the RF (radio frequency) technology field, Alaris Holdings company has grown from a small consulting service into a powerhouse, globally recognised for its extensive expertise and continuous development of intellectual property.

The Alaris Holdings Group currently consists of four entities – Alaris Antennas (based in South Africa), COJOT (based in Finland), and mWAVE Industries and Alaris USA (based in Maine, USA). With the acquisition, the Group increases its global footprint even further, boding well for future growth.

UK based Linwave Technology was founded in 2003 and focuses on the design and manufacture of  RF/microwave components and subsystems. The company supplies its advanced and customised products across multiple markets, from defence, avionics, marine, industrial, satcom and healthcare to space, wireless, transport and security. Their extensive RF/microwave capabilities were a great attraction for the Alaris Group, as was the prospect of widening its scope into other markets from its core in the defence segment.

Alaris Holdings Group CEO, Juergen Dresel, has indicated previously that Alaris set out to complement the Group with strong RF/microwave electronics design and RF assembly capabilities. Linwave Technology fits this strategic requirement like a glove. A share purchase agreement was signed on Friday 26 February, with the same effective date.

“Linwave will contribute greatly to the diversification of various elements in the Group, adding new products, new customers, new territories and new market segments like medical and aviation. There is no doubt that this will lead to some great cross-selling opportunities within the Group,” stated Juergen Dresel.

While Linwave already boasts an expert skillset in the RF/microwave field, Chris Carr, Linwave’s Sales Director, said that they are “excited to become part of an international group of companies, thereby exploiting synergies to create new business opportunities.” He added that “the acquisition will provide an opportunity to integrate our RF/microwave electronics technology with the core antenna business of Alaris, to produce cutting edge and advanced system solutions to our combined customer base.”

The acquisition is a watershed for both the Alaris Holdings Group and Linwave Technology. The Alaris Holdings subsidiaries have developed their product range over the years from a components-based offering to more complete antenna systems solutions. By adding a strong competency in RF/microwave electronics design and manufacture, which complement the product offering, the Group and its subsidiaries will be well-positioned to take a distinctive lead in a niche market. Moreover, it is expected that Alaris’s established global footprint will assist Linwave in its drive to fulfil export potential and support a wider customer base outside the UK.

The companies share very similar value systems – centred around the customer – providing dedicated engineering teams driven by an open, honest interest in supporting their customers’ needs and providing world class RF and microwave technologies for specialised requirements and harsh environments.

Ian Duke, Managing Director of Linwave Technology, noted that “the management team and shareholders of Linwave are excited about the future of the business” and confirmed that “Linwave is proud to be able to add value to the already advanced Alaris products by means of our intellectual property.”

Mr Dresel added that “the plan is that Linwave becomes the ‘go-to place’ for RF/microwave design and developments required within the Group”, concluding that “by Linwave becoming part of the ALH Group of companies, (it) will allow us to become more system orientated. This enables us to strategically move up vertically in the value chain.”

Following its normal approach, Alaris will make no changes to the Linwave management team. Linwave will join its sister companies, COJOT and mWAVE under the Alaris UK Investment holdings entity, and the Linwave board will remain majority manned by UK residents.

COJOT is part of the Alaris Holdings Group of Companies.