Omnidirectional Antennas

Kelly Hogan kshogan
Sat Mar 27 18:09:35 PST 2004


How high are you placing your 15db omni?  How long is your coax, and
what type?

A common mis-conception is that omni's have deep vertical transmission 
patterns.  We have found that the higher the gain of omni, the thinner
the doughnut of pattern around the antenna.  A lot of people place these
high gain antennas way up high, expecting good coverage, then only find 
that they are putting the sweet spot over their targeted areas.

Try lowering your antenna, or get its plot of coverage and do some 
good ol trig math to determine its best coverage area.  Then of course
trial & error is good as well. 

We use a similar setup and get nearly 6-700m of good coverage.

> Right now I am currently using a 15dBi omnidirectional antenna with 
> Host-AP on redhat 9 with a senao nl-2511 CD Plus EXT2.  I like the 
> setup as far as the card and server go, but with the antenna I haven't 
> been really impressed with it so far.  As of right now I'm getting 
> about 150m when I should be getting at least 300m.  Has anyone found a 
> good omnidir antenna for a decent price?
> I am getting ready to start my second hot-spot, am looking for a decent 
> antenna, with the same setup of card and server.
> Dave
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