A rapid locking device for a collapsible mobile aerial, where the frame of the dipole is easily attached to the main arm by a branch head. The whole operation can be carried out using one arm while the other can be used for supporting the technician. The branch head (2) fitted to the frame (1) of the dippole is linked to the main arm (3) of the aerial via an inlet hole (4). There is a flange (5) with a chamfered surface on the main arm and bearing blocks (7) with a shaft (8) parallel to the axis. There is an eccentric joint (9) with a spring which pressures against the chamfered surface of the flange.
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