Passive quadrifilar helix antenna for fixed installation. Lightweight Circularly Polarized Quadrifilar Helix for Mast Mounting Covering GPS and Iridium band: 1575 and 1616 - 1626.5 MHz. The circularly polarized antenna minimizes the fading effect often encountered in environments with reflecting obstacles. Suitable for mounting on 1” threaded water pipe. Comprehensive range of accessory mounting brackets available to make the perfect installation for your specific needs. Mounted directly on MariFix 1 / MariFix 2.(FME-female-TNC-female adapter = 10070 , FME-female with LMR400 crimp = XP-CR173-6490)