Roof structure (RFS) for a vehicle (V) comprising an antenna module and a vehicle roof wherein the antenna module is mountable to at least one opening (102; 103) of the vehicle roof : - wherein the antenna module comprises a housing and an antenna carrier and a fixation unit , - wherein the antenna carrier is arranged on a topside of the housing , - wherein the fixation unit protrudes with a head above the topside of the housing , - characterized in - that in a mounted position (MP) of the antenna module the head of the fixation unit is received in a first opening and the antenna carrier is received in a second opening of the vehicle roof and both protrude beyond an upper surface of the vehicle roof , - that the fixation unit is pivoted in the housing , - that in the mounted position (MP) and in a first turning position (FTP) of the fixation unit the antenna module is detachable pre-assembled to the vehicle roof by the fixation unit , wherein the head of the fixation unit overlaps the vehicle roof in first edge regions of the first opening and is manually compressible to a compressed state (CS) to eliminate the overlapping and - that in the mounted position (MP) and in a second turning position (STP) of the fixation unit the antenna module is locked to the vehicle roof by the fixation unit , wherein the head of the fixation unit overlaps the vehicle roof in second edge regions of the first opening and the head is compressed by the second edge regions of the vehicle roof to the compressed state (CS). - wherein the antenna module comprises a housing and an antenna carrier and a fixation unit , - wherein the antenna carrier is arranged on a topside of the housing , - wherein the fixation unit protrudes with a head above the topside of the housing , - characterized in - characterized in - that in a mounted position (MP) of the antenna module the head of the fixation unit is received in a first opening and the antenna carrier is received in a second opening of the vehicle roof and both protrude beyond an upper surface of the vehicle roof , - that the fixation unit is pivoted in the housing , - that in the mounted position (MP) and in a first turning position (FTP) of the fixation unit the antenna module is detachable pre-assembled to the vehicle roof by the fixation unit , wherein the head of the fixation unit overlaps the vehicle roof in first edge regions of the first opening and is manually compressible to a compressed state (CS) to eliminate the overlapping and - that in the mounted position (MP) and in a second turning position (STP) of the fixation unit the antenna module is locked to the vehicle roof by the fixation unit , wherein the head of the fixation unit overlaps the vehicle roof in second edge regions of the first opening and the head is compressed by the second edge regions of the vehicle roof to the compressed state (CS). - that in the mounted position (MP) and in a first turning position (FTP) of the fixation unit the antenna module is detachable pre-assembled to the vehicle roof by the fixation unit , wherein the head of the fixation unit overlaps the vehicle roof in first edge regions of the first opening and is manually compressible to a compressed state (CS) to eliminate the overlapping and - that in the mounted position (MP) and in a second turning position (STP) of the fixation unit the antenna module is locked to the vehicle roof by the fixation unit , wherein the head of the fixation unit overlaps the vehicle roof in second edge regions of the first opening and the head is compressed by the second edge regions of the vehicle roof to the compressed state (CS). <EOS>