A helical Iridium antenna which provides better performance and coverage, especially in marginal conditions, than an external patch antennaThe M1621HCT-EXT is a high performance Iridium certified passive external magnet mount antenna designed for wireless applications. The antenna is built on proprietary Maxtena HeliCore® technology. This technology provides exceptional pattern control, polarization purity and high efficiency in a very compact form factor. The M1621HCT-EXT is an external magnet mount antenna, featuring a 1.5m LRM100 coaxial cable with integrated SMA connector. 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. Ideal for use with the RockBLOCK Naked Mk2 w/SMA connector.