Antenna system for a vehicle , comprising: a first microstrip line and a second microstrip line electromagnetically matched to a frequency band of operation with a central wavelength (λ), a reflector , two radiating conductors , wherein one of the two radiating conductors is connected to the reflector through the second microstrip line and the other of the two radiating conductors is connected to a feeding point through the first microstrip line , a ground plane and a printed circuit board, wherein the two radiating conductors and the reflector are coplanarly arranged on a same dielectric substrate of the printed circuit board, wherein the dielectric substrate is disposed on the ground plane, wherein the reflector is separated from the two radiating conductors by a distance between 0.3 times and 1 time the central wavelength (λ), wherein the reflector is a rectangular region covering an area whose smallest dimension is a width (W r ) of the reflector and the two radiating conductors are covering a total area whose smallest dimension is a total width (W d ) of the radiating conductors , and the width (W r ) of the reflector is less than 6 times the total width (W d ) of the radiating conductors and equal or less than 0.5 times the central wavelength (λ), and wherein both the first microstrip line and the second microstrip line have a length of an one-fourth of an effective wavelength within the frequency band of operation; wherein the first microstrip line extends into a feeding line going in a direction of the reflector , being the feeding line isolated from said reflector and connected to the feeding point ; and wherein the second microstrip line is arranged in parallel to the first microstrip line and shorted to the ground plane and the ground plane is configured to be shorted to the reflector through a connection . a first microstrip line and a second microstrip line electromagnetically matched to a frequency band of operation with a central wavelength (λ), a reflector , two radiating conductors , wherein one of the two radiating conductors is connected to the reflector through the second microstrip line and the other of the two radiating conductors is connected to a feeding point through the first microstrip line , a ground plane and a printed circuit board, wherein the two radiating conductors and the reflector are coplanarly arranged on a same dielectric substrate of the printed circuit board, wherein the dielectric substrate is disposed on the ground plane, wherein the reflector is separated from the two radiating conductors by a distance between 0.3 times and 1 time the central wavelength (λ), wherein the reflector is a rectangular region covering an area whose smallest dimension is a width (W r ) of the reflector and the two radiating conductors are covering a total area whose smallest dimension is a total width (W d ) of the radiating conductors , and the width (W r ) of the reflector is less than 6 times the total width (W d ) of the radiating conductors and equal or less than 0.5 times the central wavelength (λ), and wherein both the first microstrip line and the second microstrip line have a length of an one-fourth of an effective wavelength within the frequency band of operation; wherein the first microstrip line extends into a feeding line going in a direction of the reflector , being the feeding line isolated from said reflector and connected to the feeding point ; and wherein the second microstrip line is arranged in parallel to the first microstrip line and shorted to the ground plane and the ground plane is configured to be shorted to the reflector through a connection . <EOS>