A method for use in a Radio Base Station, RBS, for inter-transceiver antenna calibration, the method comprising: collecting 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 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 for the inter-loop phase response difference. collecting 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 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 for the inter-loop phase response difference.