Broadband omnidirectional antenna having the following features: - a first radiator is provided which is galvanically isolated from a base plate and extends away therefrom, the first radiator having a longitudinal axis which extends at least approximately perpendicularly to the base plate; - the first radiator comprises a first end with a foot and/or feed-in point and a second end which is opposite the first end; - the first end is arranged closer to the base plate than the second end; - the first radiator comprises radiator surfaces which originate in the region of the first end and extend towards the second end or form said second end; - a distance between the radiator surfaces and the longitudinal axis increases at least in portions from the first end towards the second end; - a second radiator is provided which comprises at least one radiator surface, wherein the second radiator is arranged at and galvanically isolated from the first radiator and can be fed only or predominantly by the first radiator; - a coupling device is provided; - the coupling device comprises one or more coupling projections, wherein a first end of the coupling projection or coupling projections is galvanically connected to the radiator surface of the second radiator and extends towards the base plate; - the coupling projection or coupling projections is/are spaced further apart from the longitudinal axis than the radiator surfaces (6, 12) of the first and second radiators (2, 11); - at least one coupling surface is formed or integrally formed on a second end of the coupling projection or coupling projections that is opposite the first end and is arranged closer to the base plate than said first end, which coupling surface is galvanically connected to the relevant coupling projection; - the at least one coupling surface of the second radiator is arranged in the region of the second end parallel with the base plate or such that one of the components thereof is predominantly in parallel with said plate; characterized by the following features: - the radiator surfaces of the first radiator end at the same distance from the base plate as the radiator surfaces of the second radiator; or the radiator surfaces of the second radiator are arranged closer in the direction of the base plate than the second end of the first radiator. - a first radiator is provided which is galvanically isolated from a base plate and extends away therefrom, the first radiator having a longitudinal axis which extends at least approximately perpendicularly to the base plate; - the first radiator comprises a first end with a foot and/or feed-in point and a second end which is opposite the first end; - the first end is arranged closer to the base plate than the second end; - the first radiator comprises radiator surfaces which originate in the region of the first end and extend towards the second end or form said second end; - a distance between the radiator surfaces and the longitudinal axis increases at least in portions from the first end towards the second end; - a second radiator is provided which comprises at least one radiator surface, wherein the second radiator is arranged at and galvanically isolated from the first radiator and can be fed only or predominantly by the first radiator; - a coupling device is provided; - the coupling device comprises one or more coupling projections, wherein a first end of the coupling projection or coupling projections is galvanically connected to the radiator surface of the second radiator and extends towards the base plate; - the coupling projection or coupling projections is/are spaced further apart from the longitudinal axis than the radiator surfaces (6, 12) of the first and second radiators (2, 11); - at least one coupling surface is formed or integrally formed on a second end of the coupling projection or coupling projections that is opposite the first end and is arranged closer to the base plate than said first end, which coupling surface is galvanically connected to the relevant coupling projection; - the at least one coupling surface of the second radiator is arranged in the region of the second end parallel with the base plate or such that one of the components thereof is predominantly in parallel with said plate; - the radiator surfaces of the first radiator end at the same distance from the base plate as the radiator surfaces of the second radiator; or the radiator surfaces of the second radiator are arranged closer in the direction of the base plate than the second end of the first radiator.