Tallysman TW3742AJ Accutenna Anti-Jam Single-Band GNSS Antenna

Tallysman TW3742AJ Accutenna Anti-Jam Single-Band GNSS Antenna

The TW3742AJ anti-jam GNSS antenna is a precision high-gain GNSS antenna built with Tallysman's unique Accutenna® technology, providing single-band GPS/QZSS L1, GLONASS G1, Galileo E1 and BeiDou B1 coverage, including the satellite-based augmentation system (SBAS) available in the region of operation [WAAS (North America), EGNOS (Europe), MSAS (Japan) or GAGAN (India)].



The Tallysman anti-jam feature modifies the radiation pattern of the GNSS antenna such that it is “deaf” to signals arriving from 10 ° below and 15 ° above the horizon while slightly increasing the gain of the antenna at zenith. Since jamming signals typically originate at low elevations, the TW3742AJ antenna mitigates signals below 15 °.

Tallysman’s patented Accutenna® technology enables the TW3742AJ antenna to provide a truly circular right-hand polarized signal through the entire bandwidth, thereby enabling superior multipath signal rejection and out-of-band signal rejection. This feature makes the TW3742AJ ideal for professional precision timing and positioning applications.

The TW3742AJ features a precision-tuned, dual-feed patch element. The signals from the two orthogonal feeds are combined in a hybrid combiner, amplified in a wideband LNA, then band-split for narrow filtering and further amplified before recombination at the output. The antenna also has a strong pre-filter to mitigate inter-modulated signal interference from LTE and other cellular bands. The TW3742AJ offers an excellent axial ratio and a tightly grouped phase centre variation.

The TW3742AJ is housed in a permanent-mount metal base with two nickel-coated nuts and an IP67 weather-proof enclosure. Two mounting options are available: an L-bracket (P/N 23-0040-0); or a pipe mount (P/N 23-0065-0).


  • High-accuracy & mission-critical global positioning
  • Timing applications
  • Law enforcement and public safety


  • Accutenna® technology
  • Great axial ratio (2.0 dB typ.)
  • Low LNA noise (3.0 dB typ.)
  • High-rejection SAW filter
  • High-gain LNA (38 dB typ.)
  • Low current (19 mA typ.)
  • Wide voltage input range (2.5 to 12 VDC)
  • ESD circuit protection (15 kV)
  • IP67 weather-proof housing
  • RoHS and REACH compliant


  • Operates under ground-based jamming
  • Circular polarisation throughout the full bandwidth
  • Superior multipath signal rejection
  • Excellent signal-to-noise ratio
  • Excellent out-of-band signal rejection
  • Increased system accuracy
  • Ideal for harsh environments


Calian GNSS (formerly Tallysman Wireless) offers a warranty of 1-3 years on all of it’s products. The warranty ensures that the products are free from defects of materials or workmanship and conform to Calian’s specifications under normal use. Embedded antennas are covered by a one (1) year standard warranty. All housed antennas and accessories (inline amplifiers, splitters, and bias tees) manufactured after January 1, 2020 are covered by a three-year warranty. The warranty is covered in more detail on the Calian GNSS Warranty page.

Why Buy from Us?

In business since 2004, Canal Geomatics is an authorized dealer for Calian GNSS and has established itself as an industry-leading distributor of high-precision positioning products in North America. Our mission is to find the best solution for each unique application and extend premium support to ensure the long-term success of our customers. We offer both volume and reseller discounts for the majority of our product lines.


The TW3742AJ Accutenna® anti-jam single-band GNSS antenna is available through Canal Geomatics. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.