Taillight for vehicles or trailer trucks with built-in RF signal communication antenna, being one complete taillight which comprises: - a structure containing a base, the base comprising an anterior-internal face and a posterior face by means of which the base is attached to a surface of a vehicle or trailer truck, - a receiving housing placed at an anterior-internal face of said base; - a lighting module, having an integrated circuit board with lighting signs, fit into said receiving housing of the anterior-internal face of the base and; - an RF signal communication antenna module fit to the anterior-internal face of the base; and - a lens attached to the base covering said lighting module and RF signal communication antenna module; said lens is placed vertically, parallel and symmetrically in the extension of the front part of the taillight and fastened by its posterior-lateral extremities into the anterior-lateral extremities of the base; 15 characterized in that: said receiving housing is symmetrically disposed and built-in said base placed vertically and symmetrically in a whole extension of a posterior face of the taillight and parallel to the surface of the vehicle or trailer truck; said RF signal communication antenna module has an integrated circuit board surrounding said receiving housing, and comprises at least one opening dimensioned to surround the external perimeter of said receiving housing; said RF signal communication antenna module is placed vertically, parallel and symmetrically fit through the whole extension of the anterior-internal face of the base and said integrated circuit board comprises a set of said openings placed parallel and symmetrically spaced in the RF signal communication antenna module; wherein said receiving housing is centrally arranged in said anterior-internal face of the base, constituting a central packer; said lighting module is placed vertically and symmetrically fit in the anterior-internal face of the base through said central packer; and wherein said base has a set of connectors placed vertically, perpendicularly and symmetrically spaced on the posterior face of the base and a set of packers and clutches, including the one constituting said receiving housing, placed in parallel and symmetrically spaced in the anterior-internal face of the base. - a structure containing a base, the base comprising an anterior-internal face and a posterior face by means of which the base is attached to a surface of a vehicle or trailer truck, - a receiving housing placed at an anterior-internal face of said base; - a lighting module, having an integrated circuit board with lighting signs, fit into said receiving housing of the anterior-internal face of the base and; - an RF signal communication antenna module fit to the anterior-internal face of the base; and - a lens attached to the base covering said lighting module and RF signal communication antenna module; said receiving housing is symmetrically disposed and built-in said base placed vertically and symmetrically in a whole extension of a posterior face of the taillight and parallel to the surface of the vehicle or trailer truck; said RF signal communication antenna module has an integrated circuit board surrounding said receiving housing, and comprises at least one opening dimensioned to surround the external perimeter of said receiving housing; said RF signal communication antenna module is placed vertically, parallel and symmetrically fit through the whole extension of the anterior-internal face of the base and said integrated circuit board comprises a set of said openings placed parallel and symmetrically spaced in the RF signal communication antenna module;