Omnidirectional Pattern
http://www.f8byc.net/menu4/page10.html
Using MMIC MAR6 or MSA0885
http://perso.orange.fr/jf.fourcadier/antennes/active/active.htm
horizontal polarization, omnidirectionnal radiation pattern
http://perso.orange.fr/jf.fourcadier/antennes/fentes/fentes_e.htm
A directive antenna for the whole 23 cm band, you can build in 15 minutes.
http://perso.orange.fr/jf.fourcadier/antennes/pizza/pizza_e.htm