There is provided an antenna arrangement including at least two conductive sheet arranged around at least one ground plane for transmitting radio signals from feeder cables on a transmission frequency band such that the antenna arrangement has a substantially omnidirectional radiation pattern and the antenna arrangement is configured to polarize the radio signals from a first feeder cable horizontally in a first radiation direction of the radiation pattern, polarize the radio signals from a second feeder cable vertically in a second radiation direction of the radiation pattern, polarize the radio signals from the first feeder cable and from the second feeder cable non-linearly in other radiation directions, whereby the non-linearly polarized radio signals from the first feeder cable and the second feeder cable are substantially orthogonal.