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Omni Antenna have a broad propagation field, designed to be basically uniform in all directions.

In practice, this is not spherical, but often more Smarties-like, wide, but not high. The higher the gain, the flatter the Smarties.

Typical gain of omni's are in the 3dbi-15dbi range.

One common and relatively easy to construct type of omnidirectional antenna is the CoaxCollinear.

Some omni-directional Antenna plans:

At this stage, we have not yet seen a homebrew omni with the combination of decent gain and a suitable radiation pattern (the Smarty is tilted up rather than be level) for the >1km links we're trying to make at MW. Any results to the contrary would be much appreciated!

If you want to buy a commercial omni antenna, D-Link sells an 8dbi outdoor omni, as does External linkRojone. That is, if you missed out on The Incredible Bulk purchase of a few squillion lately. Higher gain ones are available from several US vendors, but the propagation pattern starts to get kinda thin and often has quite a deal of downtilt (which is great if you're on the top of a hill, not so great otherwise). If you really need that kind of gain, maybe you should consider a YagiAntenna or ParabolicAntenna.

Version 3 (current) modified Tue, 03 Jul 2007 23:12:18 +1000 by graybeard
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