Retainer system for a mobile-telephony antenna and a mobile-telephony component, the mobile-telephony antenna being mountable on a mast-shaped or wall-shaped support, having the following features: - for the mobile-telephony antenna, the retainer system comprises at least two antenna holding devices, which can be mounted on the antenna side and are positioned vertically or predominantly vertically mutually offset, having an upper and a lower antenna holding device, - each of the at least two antenna-side antenna holding devices is fixable or fixed directly or indirectly to a support-side antenna holding device, - at least one spacer is provided, which is part of at least a support-side antenna holding device or an antenna-side antenna holding device or is mounted as a separate component between the at least one and preferably two support-side and antenna-side antenna holding devices (7, 11), - between the upper and the lower antenna holding device (11, 7) on the one hand and between the support-side holding device and the mobile-telephony antenna on the other hand, a separating space open in a lateral direction is provided, in which a mobile-telephony component is mountable or mounted, characterised by the following further features: - the mobile-telephony component in form of a remote-radio-head is fixed on the support side by means of a retainer system, which is separated from the holding devices (11, 7) for the mobile-telephony antenna, - for this purpose, the retainer system comprises at least one support-side mobile-telephony component holding device, - the remote-radio-head comprises at least one component-side mobile-telephony component holding device, - between the support-side mobile-telephony component holding device and the respective component-side mobile-telephony component holding device, a pivoting and/or displacement plane is formed, the support-side mobile-telephony component holding device and the respectively associated component-side mobile-telephony component holding device being releasably fixed to one another via the pivoting and/or displacement plane, and - when the associated fixing means are released, the mounted remote-radio-head can be removed from the separating space in the lateral direction, by way of the component-side mobile-telephony component holding device, by displacement and/or pivoting and/or rotation, leaving behind the support-side mobile-telephony component holding device, even while the mobile-telephony antenna is still mounted. - for the mobile-telephony antenna, the retainer system comprises at least two antenna holding devices, which can be mounted on the antenna side and are positioned vertically or predominantly vertically mutually offset, having an upper and a lower antenna holding device, - each of the at least two antenna-side antenna holding devices is fixable or fixed directly or indirectly to a support-side antenna holding device, - at least one spacer is provided, which is part of at least a support-side antenna holding device or an antenna-side antenna holding device or is mounted as a separate component between the at least one and preferably two support-side and antenna-side antenna holding devices (7, 11), - between the upper and the lower antenna holding device (11, 7) on the one hand and between the support-side holding device and the mobile-telephony antenna on the other hand, a separating space open in a lateral direction is provided, in which a mobile-telephony component is mountable or mounted, - the mobile-telephony component in form of a remote-radio-head is fixed on the support side by means of a retainer system, which is separated from the holding devices (11, 7) for the mobile-telephony antenna, - for this purpose, the retainer system comprises at least one support-side mobile-telephony component holding device, - the remote-radio-head comprises at least one component-side mobile-telephony component holding device, - between the support-side mobile-telephony component holding device and the respective component-side mobile-telephony component holding device, a pivoting and/or displacement plane is formed, the support-side mobile-telephony component holding device and the respectively associated component-side mobile-telephony component holding device being releasably fixed to one another via the pivoting and/or displacement plane, and - when the associated fixing means are released, the mounted remote-radio-head can be removed from the separating space in the lateral direction, by way of the component-side mobile-telephony component holding device, by displacement and/or pivoting and/or rotation, leaving behind the support-side mobile-telephony component holding device, even while the mobile-telephony antenna is still mounted.