A method for processing communication signals in a lower and a higher frequency band, the method comprising: a multi-frequency antenna system, wherein a plurality of antennas are connected together via one or more frequency-dependent coupling elements, and each one of the antennas is connected to a corresponding output of a radio-frequency front-end via a corresponding one of a plurality of frequency-dependent switches, wherein the multi-frequency antenna system is configured by: coupling the antennas via the one or more frequency-dependent coupling elements in the lower frequency band to allow the antennas to act like a single antenna in the lower frequency band, and separating the antennas from each other in the higher frequency band so that the antennas may be controlled individually, and coupling the antennas acting like a single antenna in the lower frequency band to a predetermined one of the outputs of the radio frequency front-end via the corresponding one of the frequency-dependent switches, and coupling each one of the antennas to the corresponding one of the outputs of the radio frequency front-end in the higher frequency band via the corresponding one of the frequency-dependent switches so that the antennas may be controlled individually; the method further comprising receiving and/or transmitting radio signals on said higher and lower frequency bands concurrently via said configured multi-frequency antenna system. a multi-frequency antenna system, wherein a plurality of antennas are connected together via one or more frequency-dependent coupling elements, and each one of the antennas is connected to a corresponding output of a radio-frequency front-end via a corresponding one of a plurality of frequency-dependent switches, wherein the multi-frequency antenna system is configured by: coupling the antennas via the one or more frequency-dependent coupling elements in the lower frequency band to allow the antennas to act like a single antenna in the lower frequency band, and separating the antennas from each other in the higher frequency band so that the antennas may be controlled individually, and coupling the antennas acting like a single antenna in the lower frequency band to a predetermined one of the outputs of the radio frequency front-end via the corresponding one of the frequency-dependent switches, and coupling each one of the antennas to the corresponding one of the outputs of the radio frequency front-end in the higher frequency band via the corresponding one of the frequency-dependent switches so that the antennas may be controlled individually; the method further comprising coupling the antennas via the one or more frequency-dependent coupling elements in the lower frequency band to allow the antennas to act like a single antenna in the lower frequency band, and separating the antennas from each other in the higher frequency band so that the antennas may be controlled individually, and coupling the antennas acting like a single antenna in the lower frequency band to a predetermined one of the outputs of the radio frequency front-end via the corresponding one of the frequency-dependent switches, and coupling each one of the antennas to the corresponding one of the outputs of the radio frequency front-end in the higher frequency band via the corresponding one of the frequency-dependent switches so that the antennas may be controlled individually; the method further comprising receiving and/or transmitting radio signals on said higher and lower frequency bands concurrently via said configured multi-frequency antenna system.