An antenna for the reception of circularly polarized satellite radio signals comprising at least one horizontally oriented conductor loop arranged over a conductive base surface, said antenna having an arrangement connected to an antenna connector for the electromagnetic excitation of the conductor loop, comprising the following features: - the conductor loop is formed as a ring line radiator by a polygonal or circular closed ring line in a horizontal plane having a height h and extending over the conductive base surface; - the ring line radiator forms a resonant structure and is electrically excitable by electromagnetic excitation in a manner such that the current distribution of a propagating line wave is adopted on the ring line in a single revolving direction whose phase difference over one revolution amounts to exactly 2π; and - radiators (4, 4a-d) which are galvanically coupled to the ring line radiator, which are vertical and which extend toward the conductive base surface are present at ring line coupling points at the periphery of the ring line radiator, with the excitation of the conductor loop taking place via one of the radiators as the active radiator and the other radiators being coupled as passive radiators (4b, 4c, 4d) to the electrically conductive base surface, characterized in that at least two vertically passive radiators (4b, 4c, 4d) are present which are galvanically coupled to the ring line radiator, which extend toward the conductive base surface and of which N radiators are coupled via a reactance circuit having an active component to the electrically conductive base surface, with the loss factor of said active component respectively being larger than the value 0.1/N; in that two of these radiators are not arranged adjacent to one another at any point along the ring line radiator; in that all the remaining passive vertical radiators (4b, 4c) are coupled via lossless reactance circuits to the base surface; and in that none of the spacings between mutually adjacent ring line coupling points is smaller at the periphery of the ring line radiator than half the spacing that would result with an equidistant distribution of all the radiators over the stretched length L of the ring line radiator. - the conductor loop is formed as a ring line radiator by a polygonal or circular closed ring line in a horizontal plane having a height h and extending over the conductive base surface; - the ring line radiator forms a resonant structure and is electrically excitable by electromagnetic excitation in a manner such that the current distribution of a propagating line wave is adopted on the ring line in a single revolving direction whose phase difference over one revolution amounts to exactly 2π; and - radiators (4, 4a-d) which are galvanically coupled to the ring line radiator, which are vertical and which extend toward the conductive base surface are present at ring line coupling points at the periphery of the ring line radiator, with the excitation of the conductor loop taking place via one of the radiators as the active radiator and the other radiators being coupled as passive radiators (4b, 4c, 4d) to the electrically conductive base surface,