To eliminate the breakage and the damage of a coaxial cable and a connector by providing a rotation part to a connector for an antenna base so as to make a free declining/elevating so as to unnecessitate the provision of an extension an contraction part.

This system consists of a declining/elevating block 1 and a coaxial block 2 and an internal conductor is also incorporated for each block. A screw part provided on the upper part of a declining/elevating part by being screwed by a screw 8 is fixed to the base to fix an antenna, which is fixed to the screw part provided for the block 2 by screwing by a coaxing cable. An electric signal inputted from the coaxial cable is supplied for an antenna part fixed to the part 1 by way of a rotation part 6 through the conductor arranged inside the block 2. In addition the internal conductors are also provided with rotation parts on the center line of the rotation part to conduct electricity while declining/elevating. Consequently, a thick coaxial cable can also be used because extension and contraction is not required. In addition as the rotation part is a fully rotating type, the system can be used for an electronic equipment and an electric appliance.