For improving reception in areas with weak network coverage. Simply attach the station antennas to an outer wall of your house or on the roof of the house to the existing antenna mast using the optional wall bracket. It is suitable for D networks, E networks, for UMTS networks and the Telekom LTE city network (LTE 1800 MHz) and can be mounted horizontally or vertically. Since LTE works with MIMO ( 2x RX, 2x TX) technology, most of the well-known LTE routers already on the market (e.g. Huawaii, Speedport, FritzBox) are equipped with 2 external antenna connectors. In order to use the optimum data rate of the LTE network, you should always mount and connect two of the same type vertically on a horizontal plane in parallel at a distance of at least 20 cm when using external antennas. Our Duo Packs have been specially compiled for these applications and are equipped with all the components you need for problem-free installation.