An antenna for the reception of circularly polarized satellite radio signals, comprising at least one conductor loop arranged above a conductive base surface; and an arrangement connected to an antenna connection point for the electromagnetic excitation of the conductor loop, comprising the following features: - the conductor loop is designed as a ring line radiator by a polygonal or circular closed ring line extending at a height h < 0.15 of the free-space wavelength λ above the conductive base surface, - the ring line radiator forms a resonance structure and can be excited by the electromagnetic excitation such that the current distribution of a running line wave in a single revolving direction is adopted on the ring line, the phase difference of said line wave over one revolution amounting to just 2π, - vertical resonance radiators which are galvanically coupled to the ring line radiator at ring line coupling points (7, 7a, 7b, 7c, 7d) and which extend toward the conductive base surface are present distributed at the periphery of the ring line radiator, - at least one distribution and phase shifter network is present which has one gate T1 coupled at the input side to the antenna connection point and two gates T2, T3 whose transmission coefficients S 12 and S 13 differ from one another by a phase angle ΔΦ, comprising the following features: - the periphery of the ring line is shorter than the free-space wavelength λ, - at least three vertical radiators (4, 4a, 4b, 4c,...) are present which are coupled to the base surface, by which a resonance is produced, via reactance circuits having a capacitive reactance X, each of the gates T2, T3 is coupled to a respective ring line coupling point (7, 7a, 7b), - characterized in that the input resistance of each of the gates T2, T3 of the distribution and phase shifter network for the electromagnetic excitation of the line wave on the ring line is a real resistance in each case. - the conductor loop is designed as a ring line radiator by a polygonal or circular closed ring line extending at a height h < 0.15 of the free-space wavelength λ above the conductive base surface, - the ring line radiator forms a resonance structure and can be excited by the electromagnetic excitation such that the current distribution of a running line wave in a single revolving direction is adopted on the ring line, the phase difference of said line wave over one revolution amounting to just 2π, - vertical resonance radiators which are galvanically coupled to the ring line radiator at ring line coupling points (7, 7a, 7b, 7c, 7d) and which extend toward the conductive base surface are present distributed at the periphery of the ring line radiator, - at least one distribution and phase shifter network is present which has one gate T1 coupled at the input side to the antenna connection point and two gates T2, T3 whose transmission coefficients S 12 and S 13 differ from one another by a phase angle ΔΦ, - the periphery of the ring line is shorter than the free-space wavelength λ, - at least three vertical radiators (4, 4a, 4b, 4c,...) are present which are coupled to the base surface, by which a resonance is produced, via reactance circuits having a capacitive reactance X, each of the gates T2, T3 is coupled to a respective ring line coupling point (7, 7a, 7b), - characterized in that