[Antennas] Quadrifilar Helix

[Mike Miller]

I have been researching the quadrifilar helix on the web for 
possible use as a 2m ISS packet antenna. Most of what I've found 
is for 137 MHz weather satellite use. Has anyone here built and 
used a 2 meter version of this antenna?

I've just finished building a copper pipe version of L. B. 
Cebik's Moxon Turnstile antenna and so far it seems to be 
working well for the higher elevation passes, but leaves 
something to be desired when the space station is less than 30 
degrees above the horizon.

Will a quadrifilar helix provide a noticeable improvement over 
the Moxon turnstile at lower elevation angles?

Are there any good websites that provide an easy to build set of 
plans that result in working 2 meter quadrifilar helix? 

Are there any other antenna designs that provide a pattern 
similar to the quadrifilar helix?

Thanks for any input,
Mike kc9doa