Michel wrote:
I am looking for a schematic for a homebrew Sperrtopfantenne. I like te
construcion pretty much, but I was not able to find construcion plans on the
internet.

Second google hit for "Sperrtopf" brought up this article
including construction plans:
http://download.antennex.com/hws/ws1002/sperrtopf.pdf

73,
--
Fabian Kurz, DJ1YFK * Dresden, Germany * http://fkurz.net/
Online Log: http://dl0tud.tu-dresden.de/~dj1yfk/log.html