| 摘要 |
<p>The device consists of a hollow extensible mast (4), a piston- cylinder apparatus (9) arranged in the mast and a rod (16), preferably constructed as an antenna, which is rigidly attached to a piston (15) of the apparatus (9) and is retracted and extended by means of this piston. For the purpose of achieving a small constructional height and a large radiating length of the overall antenna relative to said height, the piston-cylinder apparatus (9) is built to be telescopic in several stages and, in the operating position, is constructed as an antenna region along its section (11) projecting from the mast (4). <IMAGE></p> |
