Here is my first personally asembled omni directional antenna. The antenna construction workshop was one of the best practical classes that i enjoyed at the wireless communications camp in oegstgreest - leiden.
More antenna details, http://www.woaf.nl/metingen.php?antenne=6
The workshop was conducted by Erwin Gijzen, who is part wirelessnederland.nl group. His personal webpage, http://www.pe2er.nl/