A MIMO antenna system for a vehicle comprising first and second monopole antennas, which comprises first, second and third conductors. First and second conductors are electrically connected in parallel, and the third conductor is coupled to the first and second conductors. The first conductor has a height (H1) and thickness (t1) such that the H1/t1 ratio is within 5 to 45 to provide a resonant frequency at a first LTE frequency band. The second conductor has a height of 30%-60% H1 to provide a resonant frequency at a second LTE frequency band. The third conductor provides resonant frequencies at third and fourth LTE frequency bands, and having an electrical length such that the coupling level of the third conductor with respect to first and second conductors in the third and fourth LTE frequency bands is greater than 10 dB.