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For standard direction finding you will need five identical omni-directional antennas. You can compromise and use fewer antennas, but for best performance we recommend using all five antennas. These are typically magnet mount whip antennas, or dipoles. We recommend always using a Uniform Circular Array (UCA) antenna arrangement as it can determine bearings from all directions. Linear arrays are restrictive in that they do not know the difference between a signal coming from in front, or behind the array,