<p>One ground conductor (1) and the other ground conductor (2) have a sliding structure, and the other ground conductor (2) is provided with a radiation element (3). The one ground conductor (1) and the other ground conductor (2) are provided, respectively, with one connection terminal (5) and the other connection terminal (6) that are electrically connected when they are pulled out. A load (7) is connected in series between the other connection terminal (6) and the other ground conductor (2), and the one ground conductor (1) is electrically connected with the other ground conductor (2) through the load (7) when they are pulled out.</p>
