| 摘要 |
PROBLEM TO BE SOLVED: To provide a two-frequency antenna having a good sensitivity which has nearly the same shape as that of the conventional one and can be installed by nearly the same work as in installing one conventional whip antenna. SOLUTION: The two-frequency antenna has such a structure that a spiral second antenna element 20 is connected in an antenna top section 17, to one end of a bar-like first antenna element 10 covered with a tube 21 which can slidably move in a holder 14 and, a conductive stopper 13 is connected to the other end of the first antenna element 10. In the holder 14, a spiral third antenna element 30 is provided.
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