Embodiments enable discovery of services in a wireless communications medium. The reconfigurable test system may include a plurality of test modules, a plurality of network interface units, a plurality of bypass units, and a multi-port switch. With such a structure, the apparatus for refuge from high building and method for refuge thereof can be achieved. The control signal wiring conductor is located on a dielectric layer close to the second main surface of the multilayer substrate, and the high-frequency signal wiring conductor is located on a dielectric layer close to a first main surface of the multilayer substrate. The invention also relates to the use of the composite material and to the use of at least one fluorinated homo- or copolymer grafted with at least one carboxylic polar function for increasing the tensile strength of a composite material containing the above nanotubes dispersed in a fluorinated polymer matrix.