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Quadrafilar Helix antenna plans, formulae, etc

hello all and thanks for the bandwidth,

I'm looking for plans, formulae, etc on the Quadrafilar Helix antenna.
nothing i've seen to date gives very much detail, especially when it comes
to the matching circuit.

i have looked in the Satellite Experimenters Handbook, 2nd Edition, and its
not completly helpfull.

what i'm trying to build is a decent antenna for a GPS receiver, again all
the plans for plate type, etc are not completly succesful, in fact i've had
my best result by scaling down a turnstile, but its to flimsy.

am i to picky?

SO, please help if you can, there must be some good repeatable plans or
ideas out there.