Method for fine-tuning the performance of a folded monopole antenna fixed in a vehicle

A method for fine-tuning the performance of an antenna of the folded monopole type fixed within a vehicle, particularly a car, the antenna (5) comprising a support body (6), which is substantially flat and is arranged between a chassis (3) and a body (4) of the vehicle (1), and a conducting element (7), which is folded a plurality of times along the support body (6), the antenna (5) being characterized by nominal values of a plurality of performance parameters;

• the method comprising:
• after fixing the antenna (5) in the vehicle (1), measuring one or more of said performance parameters;
• comparing the measured values with the corresponding nominal values to identify any deviations between the measured values and the corresponding nominal values beyond relative margins;
• and
• attaching at least one element (13-16) of dielectric or magnetic/conductive or mixed dielectric-magnetic material to at least one respective position of the antenna (5), such position being determined by deviations between measured values and corresponding nominal values.