An electronic tag reading apparatus, comprising: a casing including a chamber into which an electronic tag can be placed for reading; a movable antenna placed in proximity to the chamber, comprising: a holder; an antenna radiator element attached to the holder; characterised by further comprising: a first feed element that is attached to the holder and electromagnetically coupled to the antenna radiator element; a base plate in a facing arrangement with the holder; a second feed element on the base plate and configured to face and overlap at least a portion of the first feed element; and a mechanism configured to move the holder in a longitudinal direction of the second feed element while maintaining an interval between the first and second feed element permitting energy to be transferred between the first and second feed elements; wherein the electronic tag reading apparatus further comprises: a controller configured to cause the mechanism to move the holder in the longitudinal direction of the second feed element during a tag reading process. a casing including a chamber into which an electronic tag can be placed for reading; a movable antenna placed in proximity to the chamber, comprising: a holder; an antenna radiator element attached to the holder; characterised by further comprising: a first feed element that is attached to the holder and electromagnetically coupled to the antenna radiator element; a base plate in a facing arrangement with the holder; a second feed element on the base plate and configured to face and overlap at least a portion of the first feed element; and a mechanism configured to move the holder in a longitudinal direction of the second feed element while maintaining an interval between the first and second feed element permitting energy to be transferred between the first and second feed elements; wherein the electronic tag reading apparatus further comprises: a controller configured to cause the mechanism to move the holder in the longitudinal direction of the second feed element during a tag reading process. a holder; an antenna radiator element attached to the holder; characterised by further comprising: a first feed element that is attached to the holder and electromagnetically coupled to the antenna radiator element; a base plate in a facing arrangement with the holder; a second feed element on the base plate and configured to face and overlap at least a portion of the first feed element; and a mechanism configured to move the holder in a longitudinal direction of the second feed element while maintaining an interval between the first and second feed element permitting energy to be transferred between the first and second feed elements; wherein the electronic tag reading apparatus further comprises: a controller configured to cause the mechanism to move the holder in the longitudinal direction of the second feed element during a tag reading process. a first feed element that is attached to the holder and electromagnetically coupled to the antenna radiator element; a base plate in a facing arrangement with the holder; a second feed element on the base plate and configured to face and overlap at least a portion of the first feed element; and a mechanism configured to move the holder in a longitudinal direction of the second feed element while maintaining an interval between the first and second feed element permitting energy to be transferred between the first and second feed elements; wherein the electronic tag reading apparatus further comprises: a controller configured to cause the mechanism to move the holder in the longitudinal direction of the second feed element during a tag reading process.