| 摘要 |
A base side connecting mechanism ( 30 ) comprises a holder ( 40 ), a plug metal ( 50 ) and a sleeve ( 70 ). The plug metal ( 60 ) has a shaft ( 51 ) and a lock pin ( 52 ) projecting from the shaft ( 61 ) in a radial direction. The sleeve ( 70 ) is disposed to move slidingly along an axial direction of the shaft ( 61 ), is supported by the plug metal ( 60 ) through a wave washer ( 60 ), and receives biasing power toward an antenna mast ( 100 ) side. A mast side connecting mechanism ( 120 ) comprises a circular cylinder portion ( 121 ). The circular cylinder portion ( 121 ) is formed to press the sleeve ( 70 ) along the axial direction and has loosely penetrated portions ( 124, 125 ) in which the lock pin ( 52 ) can move along a circumferential direction and in which other end portions are large-diameter.
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