The TW2505 employs Tallysman’s unique Accutenna™ technology in a magnet mount, passive left hand circularly polarised antenna for the 1610 to 1620 MHz frequency band and specifically designed to maximise the performance of the Globalstar™ STU (Simplex Transmit Unit) Modem.


  • Accutenna™ Technology
  • High gain: 4.25dBic
  • Circular response over entire bandwidth


  • Superior multipath signal rejection
  • Higher transmission success rates
  • Compact form for flexible use
OEM antennas are easily detuned by the local environment. Tallysman offers custom tuning services for optimized integration into OEM end-user devices. For further details, please download the Datasheet. Iridium™ and Globalstar™ are the property and trademarks of Iridium Communications Inc. and Globalstar, Inc. respectively.