PURPOSE: To reduce the material cost and the personnel cost required for the installation of a coaxial cable, by providing a support one end of which is connected to ground and the other end of which is fitted with a part of a center conductor of the coaxial cable.

CONSTITUTION: One end of the support 10 is fixed to ground and the other end is fitted with a part of the center conductor 3 of the coaxial cable 1, and the cable is installed linearly by applying a tensile force to the center conductor 3 and the coaxial cable 1 is supported at a prescribed distance to ground 5. Further, a matching device 11 is connected to the center conductor 3 of the coaxial cable 1 supported by the support 10 and an outer tube conductor 2 supported by the center conductor 3 to form an impedance matching circuit with a feeder line 8.