I have a need for an omni-directional antenna and thought that the plans at http://www.guerrilla.net/reference/antennas/2ghz_collinear_omni_lowpwr/ were about the most straightforward. I'm not reproducing my build details since it's already covered in this link.

(It now appears that guerrilla.net has disappeared from the Internet but I have found a cached copy of the instructions so am now hosting the instructions here)

Low Power 5dBi Omni-directional antenna build plans

2.4GHz Co-linear Omni-directional antenna build plans

I bought my brass rods from McQuire Enterprises, a UK mail order model shop, http://www.modellers-supplies.co.uk/acatalog/Modeller_s_Supplies__Imperial_round_brass_tube_12__137.html

       

Attached to a 3' cranked mast for testing purposes, once again using the trusty suction cups on flexible stalks that come with Halfords mobile phone holders.

Attached to the house with an SMC2652W Access Point in a weatherproof box

Thanks to - www.nodomainname.co.uk