In accordance with the invention a thread carrying apparatus is proposed with a thread lying in contact with or passing along the thread carrying apparatus with friction in the operating state. The self impedance of dipole antenna 12, the self impedance of parasitic element 14, and the mutual impedance between dipole antenna 12 and parasitic element 14 change as the length and girth of dipole antenna 12 and parasitic element 14, and the distance therebetween are adjusted to predetermined levels, so as to broaden bandwidth by changing the input impedance of built-in antenna 10. The method may further include determining a group of alignment points traversed by the gesture and respective cost values for each of at least two keys of the plurality of keys.