Omni Antennas
Omnidirectional antennas, or omni antennas, are built to send and receive signals in all horizontal directions. They're really good at giving you a signal no matter where you're situated around the antenna—they just don't work very well if you try and use them behind or underneath the antenna. Because of their reliable radiation patterns, which are often supported by an even better radiation pattern in the antenna's feed, omni antennas are useful for applications requiring not just adequate signal coverage but also evenly distributed signal strength over a relatively wide area.
Although omni antennas typically have a lower gain than directional antennas (which are known for their higher gain), they are designed to radiate signals over a 360-degree area. This is perfect for covering the kinds of services you find in the MHz range, like FM radio or cellular networks, because those services tend not to need the kind of gain you get from an antenna that's focused in one direction.
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