The present invention relates to a method for acquiring a configuration of a re-configurable antenna, having at least two different antenna element configurations, where the antenna's element mutual coupling characteristics are known in advance in the form of an antenna coupling matrix (Ck(n)), the acquired configuration having a desired effect on a transmission channel, the method comprising the steps: setting an initial configuration of the re-configurable antenna, resulting in an initial coupling matrix (C0); estimating the transmission channel matrix (Ĥ(n)), which transmission channel matrix (Ĥ(n)) includes the effect of the antenna; calculating a generic transmission channel matrix ({tilde over (Ĥ)}(n)), which generic transmission channel matrix ({tilde over (Ĥ)}(n)) excludes the effect of the antenna; and extracting a coupling matrix (C) that provides a desired transmission channel matrix (H(n)), including the effect of the antenna.