A pull-out guide for drawers including a first rail and at least one second rail, and at least one carriage is arranged between the two rails. The method comprises accumulating data associated with an input signal over a period of time; detecting the sample of the input signal at a predetermined time; comparing the sample of the input signal to the accumulated data; and determining whether the sample of the input signal is acceptable to be used to calculate parameters for the predistortion circuit. The pattern comprises a first and second antenna arm, which together for a PIFA antenna and are resonating in a first and second frequency band, respectively.