The aim of this paper is to describe the behaviour of previous-day radio listeners according to the number of listening sessions, that is the number of periods they are in contact with this medium in general. The article is in 4 parts. In the first part, we will introduce the radio survey which is the benchmark reference in France; the second part will be devoted to socio-demographic analysis and a description of the equipment of the four groups defined according to the number of daily radio- listening sessions. Part 3 studies the connection between the number of listening sessions and the number of stations listened to. The fourth chapter concentrates on studying how the listening sessions are positioned throughout the day, depending on the attitude group and the session's ranking in the succession of time-slots of radio contact. Radio as a media will be taken overall, without referring to its various components: groups or stations.