An outdoor luminaire for suspended mounting from, or attached to, a line, the luminaire comprising: - a housing of the luminaire having - a first exit window for egress of illumination light and - a second exit window for ingress and egress of a radio communication signals; - mounting point attached to the housing for attaching the housing to the line; - a power input for providing power to the luminaire; - a levelling unit attached to the housing or to a member that is attached to the housing in a fixed manner, and to an antenna unit inside an interior cavity of the housing, the levelling unit configured to either passively, utilizing gravity, or actively, utilizing a rotational actuator, counter rotational movement of the luminaire along a rotational axis parallel to the line at the mounting point; - a first modulation unit for use as a communication node in a wireless data network connected to the antenna unit, the first modulation unit configured to generate a first modulation signal; - the antenna unit attached to the levelling unit, wherein the antenna unit comprises at least one antenna for: - emitting a first radio signal based on the first modulation signal through the second exit window along a radiation pattern having a main lobe, when the luminaire is level, in line with a plane orthogonal to the gravitational axis when the luminaire is mounted and - receiving a second radio signal through the second exit window; and - a lighting unit comprising one or more light sources for emitting illumination light through the first exit window. - a housing of the luminaire having - a first exit window for egress of illumination light and - a second exit window for ingress and egress of a radio communication signals; - a first exit window for egress of illumination light and - a second exit window for ingress and egress of a radio communication signals; - mounting point attached to the housing for attaching the housing to the line; - a power input for providing power to the luminaire; - a levelling unit attached to the housing or to a member that is attached to the housing in a fixed manner, and to an antenna unit inside an interior cavity of the housing, the levelling unit configured to either passively, utilizing gravity, or actively, utilizing a rotational actuator, counter rotational movement of the luminaire along a rotational axis parallel to the line at the mounting point; - a first modulation unit for use as a communication node in a wireless data network connected to the antenna unit, the first modulation unit configured to generate a first modulation signal; - the antenna unit attached to the levelling unit, wherein the antenna unit comprises at least one antenna for: - emitting a first radio signal based on the first modulation signal through the second exit window along a radiation pattern having a main lobe, when the luminaire is level, in line with a plane orthogonal to the gravitational axis when the luminaire is mounted and - receiving a second radio signal through the second exit window; and - emitting a first radio signal based on the first modulation signal through the second exit window along a radiation pattern having a main lobe, when the luminaire is level, in line with a plane orthogonal to the gravitational axis when the luminaire is mounted and - receiving a second radio signal through the second exit window; and - a lighting unit comprising one or more light sources for emitting illumination light through the first exit window.