DUMPING TYPE ANTENNA DEVICE

PROBLEM TO BE SOLVED: To reduce costs, execution work or the like so as to effectively suppress vibrations with a compact device by providing a dumping device having a dumping ability corresponding to the length and weight of an antenna part on a supporting tower including an antenna attaching pillar. SOLUTION: A square antenna attaching pillar 3 is erected on an iron tower 2, an antenna 4 is attached and a dumping device 10 is provided in the tip of the pillar 3. The device 10 is constructed in such a manner that steel balls 12 and disk dumping weights 13 are alternately provided in a cylindrical housing container 11 in multi-stages, the steel balls 12 are laid and the weights 13 are housed so as to have proper clearance between the contact plates of the inner surface of the housing container 11. When the pillar 3 is swung, the weights 13 are caused to remain in original positions by inertia and clash with the contact plates. Since the clashing motion and the vibration cycle of the antenna 4 are roughly equal to each other and phases are shifted, vibration energy is canceled by the motion energy of the weights 13 and thus vibrations are suppressed. Since a dumping ability corresponding to the length and weight of only the antenna part, the dumping device is reduced in size and weight and the difficulty of execution and cost increases are prevented.