A variety of antenna options exist for VHF telemetry. To date, users have used 3, 5, 6, and 9-element Yagi directional antennas, and single-pole omni-directional antennas. The 9-element Yagis have a long, narrow detection range, whereas 3, 5, or 6-element Yagis have gradually shorter and wider detection ranges. Omni-directional antennas are best suited for determining species presence-absence patterns (e.g. seabirds at a colony), or for detecting birds in close proximity to stations (within a few hundred metres), but not for providing directional information (e.g. departure directions of songbirds from a stopover site).