Felim,
Here are some helix info websites.
1.http://www.qsl.net/ve3cvg/antennas/ Good antenna website plus 2400 MHz helix.
2.http://www3.sympatico.ca/b.zauhar/ A lot of info on this page with 2400 and 435 MHz helix projects.
3.http://www.g6lvb.com/index.htm Great site! Check out quadruple helix for AO40.
4.http://members.aol.com/k5oe/ Jerry's site has a lot of useful helix data. Check out the helix projects by clicking the home brew page at left bottom.
5.http://www.electric-web.org/2m_helix_antenna.htm VK5ZAI's 2 meter helix
6.http://webpages.charter.net/n4wyk/ Click satellite website then click 2401 MHz helix at left.
7. The 2006 ARRL Handbook has a excellent "L" band helix project.
If I can be of any further assistance, please email.
73, Mike K9QHO AMSAT 33589