Abstract: The invention relates to an antenna with a rod and an antenna head, which antenna is telescopic within a guiding tube having a zone of electric contact with the circuits associated with the antenna. The extremity of the tube is either closed by a plug provided to round the shape of the extremity, or deformed, for example by hot deformation, so as to give it a rounded shape. In either case, the realization is very simple, efficient and inexpensive and may be used in any electronic signal transmission system comprising a telescopic antenna for the transmission and/or reception of these signals.