Jim mentioned: > There was one in either the ARRL Satellite Handbook, or the VHF/UHF
antenna handbook.
Helix antenna articles have also been published in the AMSAT Journal over the past decade:
AMSAT Journal, May/June 2008 - "Helix Antenna Mathematics and Construction Techniques", John Henderson, N4NAB
AMSAT Journal, September/October 2008 - "A 52 Turn Helix Antenna for S-Band that Overperforms", Clare Fowler, VE3NPC (shows useful details on construction tips although the dimensions obviously differ for 2 meter band)
AMSAT Journal, May/June 2011 - "Confessions of a Helix Junkie", Mike Williams, K9QHO
If you don't have the printed copies they were in the AMSAT Journal Archive DVD which appears to be out of stock in the AMSAT Store at the moment.
-- 73 de JoAnne K9JKM k9jkm@amsat.org