A method for use in a Radio Base Station, RBS, for inter-transceiver antenna calibration, the method comprising: collecting (s510) a first phase difference ( φ 12 ) between a first signal ( s 1 ) and a first reception signal ( Y 1 ) and a second phase difference ( φ 21 ) between a second signal ( s 2 ) and a second reception signal ( Y 2 ), wherein the first signal ( s 1 ) is transmitted through a reference transmission path (11 R ) of a first transceiver and received through a reference reception path (22 R ) of a second transceiver as the first reception signal ( Y 1 ), the second signal ( s 2 ) is transmitted through a reference transmission path (21 R ) of the second transceiver and received through a reference reception path (12 R ) of the first transceiver as the second reception signal ( Y 2 ); determining (s520) an inter-loop phase response difference ( θ 1 ,loop - θ 2 ,loop ) between a first reference path loop of the first transceiver and a second reference path loop of the second transceiver by subtracting the second phase difference ( φ 21 ) from the first phase difference ( φ 12 ), wherein the first reference path loop consists of the reference transmission path (11 R ) and the reference reception path (12 R ) of the first transceiver , and the second reference path loop consists of the reference transmission path (21 R ) and the reference reception path (22 R ) of the second transceiver ; and compensating (s530) for the inter-loop phase response difference. collecting (s510) a first phase difference ( φ 12 ) between a first signal ( s 1 ) and a first reception signal ( Y 1 ) and a second phase difference ( φ 21 ) between a second signal ( s 2 ) and a second reception signal ( Y 2 ), wherein the first signal ( s 1 ) is transmitted through a reference transmission path (11 R ) of a first transceiver and received through a reference reception path (22 R ) of a second transceiver as the first reception signal ( Y 1 ), the second signal ( s 2 ) is transmitted through a reference transmission path (21 R ) of the second transceiver and received through a reference reception path (12 R ) of the first transceiver as the second reception signal ( Y 2 ); the first signal ( s 1 ) is transmitted through a reference transmission path (11 R ) of a first transceiver and received through a reference reception path (22 R ) of a second transceiver as the first reception signal ( Y 1 ), the second signal ( s 2 ) is transmitted through a reference transmission path (21 R ) of the second transceiver and received through a reference reception path (12 R ) of the first transceiver as the second reception signal ( Y 2 ); determining (s520) an inter-loop phase response difference ( θ 1 ,loop - θ 2 ,loop ) between a first reference path loop of the first transceiver and a second reference path loop of the second transceiver by subtracting the second phase difference ( φ 21 ) from the first phase difference ( φ 12 ), wherein the first reference path loop consists of the reference transmission path (11 R ) and the reference reception path (12 R ) of the first transceiver , and the second reference path loop consists of the reference transmission path (21 R ) and the reference reception path (22 R ) of the second transceiver ; and the first reference path loop consists of the reference transmission path (11 R ) and the reference reception path (12 R ) of the first transceiver , and the second reference path loop consists of the reference transmission path (21 R ) and the reference reception path (22 R ) of the second transceiver ; and compensating (s530) for the inter-loop phase response difference. <EOS>