Base station antenna module comprising: a radio unit housing ; and an antenna attached to the radio unit housing such that an air channel is formed between the radio unit housing and the antenna , the radio unit housing having a first side which corresponds to the backside of the radio unit housing and the antenna having a second side which corresponds to the backside of the antenna, the first side opposing the second side , the radio unit housing further comprising at least one holder configured to hold the antenna and to space the antenna from the first side of the radio unit housing such that the antenna is held by each of the at least one holder and the air channel is formed between the first side of the radio unit housing and the opposing second side of the antenna , wherein at least one of the at least one holder comprises a connector for establishing an electrical connection between a radio unit of the radio unit housing and the antenna , the radio unit housing further comprising a heat sink arranged at the outside of the radio unit housing at the first side of the radio unit housing and facing the antenna ; wherein the heat sink is configured to dissipate heat from a radio unit inside the radio unit housing ; wherein the air channel runs along the heat sink , wherein the heat sink comprises a plurality of straight fins forming the air channel , characterized in that the straight fins are inclined in an angle between 25° and 45° relative to a long side of the radio unit housing , and a ratio between a length of the radio unit housing in which the straight fins extend and a length of a short bottom side of the radio unit housing is greater than or equal to 1.5. a radio unit housing ; and an antenna attached to the radio unit housing such that an air channel is formed between the radio unit housing and the antenna , the radio unit housing having a first side which corresponds to the backside of the radio unit housing and the antenna having a second side which corresponds to the backside of the antenna, the first side opposing the second side , the radio unit housing further comprising at least one holder configured to hold the antenna and to space the antenna from the first side of the radio unit housing such that the antenna is held by each of the at least one holder and the air channel is formed between the first side of the radio unit housing and the opposing second side of the antenna , wherein at least one of the at least one holder comprises a connector for establishing an electrical connection between a radio unit of the radio unit housing and the antenna , the radio unit housing further comprising a heat sink arranged at the outside of the radio unit housing at the first side of the radio unit housing and facing the antenna ; wherein the heat sink is configured to dissipate heat from a radio unit inside the radio unit housing ; wherein the air channel runs along the heat sink , wherein the heat sink comprises a plurality of straight fins forming the air channel , characterized in that the straight fins are inclined in an angle between 25° and 45° relative to a long side of the radio unit housing , and a ratio between a length of the radio unit housing in which the straight fins extend and a length of a short bottom side of the radio unit housing is greater than or equal to 1.5. <EOS>