TALYSMN~Globalstat STU Antenna The TW3500 employs Tallysman’s unique Accutenna™ technology in a magnet mount, passive left hand circularly polarised antenna for the 1610 to 1620 MHz frequency band, certified and specifically designed to maximise the performance of the Globalstar™ STU (Simplex Transmit Unit) Modem. Features Features Accutenna™ Technology High gain: 4.25dBic Circular response over entire bandwidth For further details, please download the Datasheet.