Iridium Portable Auxiliary Antenna M1621HCT-EXT CERTIFIED: Iridium certified passive external magnet mount antenna with 1,500mm (5') and Iridium TNC connector. Connect directly to your Iridium satellite phone's external antenna adapter NEW: This Maxtena M1621HCT-EXT is now included with most Iridium Extreme and Iridium 9555 satellite kits and replaces flat style Iridium auxiliary antenna SYN7391A. VERSITILE: The very small size and light weight make this helical Iridium antenna unique in the market and perfect for various commercial and industrial applications. This antenna is the ideal solution for the most extreme and demanding applications where reliable satellite reception and high accuracy are required. It can be used to boost the performance of the Iridium handsets among other uses. COMPATIBILITY: Works with Iridium satellite phones using the external antenna adapter. Iridium Extreme, Iridium 9555, Iridium 9505A, Iridium 9505 & Iridium GO! Part Number: 100-00044-01