Antenna, in particular a mobile communication antenna, having the following features: - having a plurality of radiators, - the radiators are arranged in one or in a plurality of antenna columns on a reflector front side of at least one reflector of the antenna, which antenna columns extend in parallel with one another, - a first component and/or wiring compartment is provided on a reflector rear side of the reflector opposite the radiators for accommodating passive components and/or wiring leading to the radiators, - having a housing in the form of a radome for accommodating the at least one reflector and the associated radiators as well as the passive components and/or wiring, wherein the radome comprises a front radome wall in the direction of radiation of the radiators, - a complete reflector of the antenna is provided, - the complete reflector is formed in one piece or is integrally connected to the at least one or the plurality of reflectors or the complete reflector comprises the at least one or the plurality of reflectors, - the complete reflector comprises at each of its two outer longitudinal sides extending in the longitudinal direction a first screening wall which screens the first component and/or wiring compartment, - the first screening walls are each followed directly or indirectly by a second screening wall, - the two second screening walls extending at the longitudinal sides of the complete reflector project in the rearward direction of the antenna beyond a mounting plane or a sectional plane, along which the first component and/or wiring compartment is separated from a second component compartment or is divided into the first component and/or wiring compartment and the second component compartment, wherein the second component compartment is provided to accommodate active components, - the radome has a rear wall which is integrally connected via radome side walls to the front radome wall, - the radome has in cross section from its side wall portions in the transition region to its rear wall a slot- and/or groove-shaped pocket in which the associated second screening wall engages in the mounted state, and - the complete reflector, together with the mounted radiators and its first component and/or wiring compartment, can be pushed axially out of or into the radome. - having a plurality of radiators, - the radiators are arranged in one or in a plurality of antenna columns on a reflector front side of at least one reflector of the antenna, which antenna columns extend in parallel with one another, - a first component and/or wiring compartment is provided on a reflector rear side of the reflector opposite the radiators for accommodating passive components and/or wiring leading to the radiators, - having a housing in the form of a radome for accommodating the at least one reflector and the associated radiators as well as the passive components and/or wiring, wherein the radome comprises a front radome wall in the direction of radiation of the radiators, - a complete reflector of the antenna is provided, - the complete reflector is formed in one piece or is integrally connected to the at least one or the plurality of reflectors or the complete reflector comprises the at least one or the plurality of reflectors, - the complete reflector comprises at each of its two outer longitudinal sides extending in the longitudinal direction a first screening wall which screens the first component and/or wiring compartment, - the first screening walls are each followed directly or indirectly by a second screening wall, - the two second screening walls extending at the longitudinal sides of the complete reflector project in the rearward direction of the antenna beyond a mounting plane or a sectional plane, along which the first component and/or wiring compartment is separated from a second component compartment or is divided into the first component and/or wiring compartment and the second component compartment, wherein the second component compartment is provided to accommodate active components, - the radome has a rear wall which is integrally connected via radome side walls to the front radome wall, - the radome has in cross section from its side wall portions in the transition region to its rear wall a slot- and/or groove-shaped pocket in which the associated second screening wall engages in the mounted state, and - the complete reflector, together with the mounted radiators and its first component and/or wiring compartment, can be pushed axially out of or into the radome.