An automobile antenna assembly including a housing adapted for installation on a roof of an automobile, the housing having a base portion and a fin portion extending from the base portion, a radio antenna disposed within the fin portion, and a photo radiation intensity sensor disposed within the base portion, the photo radiation intensity sensor including a first light detecting element located on a first side of the fin portion and a second light detecting element located on a second side of the fin portion opposite the first side, wherein at least a portion of the base portion is translucent for allowing light to be received by the first and second light detecting elements, the fin portion providing a light barrier between the first light detecting element and the second light detecting element.