Tallysman TW2500

Tallysman TW2500 Magnet Mount Globalstar STU Antenna

The TW2500 by Tallysman Wireless is a professional grade, magnet mount, passive left hand circularly polarised antenna for the 1610 to 1620 MHz frequency band, specifically designed to maximize the performance of the Globalstar STU Modem.



The TW2500 features a high performance dual feed patch element that provides great axial ratio (3 dB max) over the entire Globalstar frequency band, thus signals at the band edges remain truly circular, unlike the response of single feed antennas.

The TW2500 is housed in a compact, industrial grade, weather-proof, magnet mount enclosure, with threaded base holes for screw down attach. It is available with a 75 cm cable, allowing for the STU modem to be mounted out of the elements and reach, and still providing excellent Globalstar signal coverage.


  • Simplex Transmit Unit (STU) Applications
  • Sea & Land Container Tracking
  • Military & Security
  • Fleet Management & Asset Tracking
  • Marine & Avionics Systems
  • Law Enforcement & Public Safety


  • Custom high gain 4 dBic dual-feed patch
  • Great axial ratio, 3 dB over full bandwidth
  • ESD 15 KV circuit protection
  • Weather proof, IP67 housing
  • Robust Industrial grade enclosure
  • Magnet or screw mount
  • Wide range of connector options


  • Excellent circular polarized signal transmission
  • Industrial temperature range
  • Rugged Design
  • Ideal for harsh environments
  • RoHS compliant
  • Remote STU antenna

Ordering Information

  • TW2500 Globalstar STU antenna, 50 cm cable, SMA Male – 32-2500-0
  • TW2500 Globalstar STU antenna, 50 cm cable, TNC Male – 32-2500-1
  • TW2500 Globalstar STU antenna, 50 cm cable, MCX Male – 32-2500-2