| 摘要 |
A helical antenna (17)is permanently mounted onto the housing (15) of a radio transmitter/receiver, such as a mobile cellular telephone. An elongate antenna (18) is mountable within the housing so as to be movable between a retracted position (FIG. 1) and an extended position (2). The elongate antenna (18) has a conductive portion (18c) arranged to short-circuit the helical antenna (17) when said helical antenna is placed in its extended position.
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