The invention provides an antenna arrangement for a wireless communication system arranged to have at least one transmit mode and at least one receive mode, the arrangement comprising at least three directional antennas (601, 602, 603) in an antenna configuration. Each directional antenna is arranged to have an azimuthal radiation pattern shaped as a beam, each beam covering an angular sector, such that a combined radiation pattern of all beams in a first transmit mode is arranged to provide a full 360° omnidirectional coverage. By combining localization and polarization (P1, P2) of the directional antennas an omnidirectional radiation pattern substantially without null-depths in the azimuthal plane can be created when the radiation pattern of the directional antennas are combined. The invention also provides a corresponding method and a base station for communication with mobile terminals in a telecommunications network equipped with the antenna arrangement.