Just scale the dimensions proportionally (except wire diameter);
ratio = 144/435
I built a 14 turn 437 MHz helical back in 1996 to receive the MGS beacon and built a 2.4 GHz 6-turn helical for 33-inch offset dish feed for AO-40. Plenty information in Amsat Archives. Original Kraus-W8JK design is optimistic in gain calculation. http://www.kl7uw.com/Satellite%20feed.jpg
W9EK had good construction hints in prior publications.
For receive-only do not sweat getting a good SWR. I used a 1/4 wavelength long 1/8 inch wide brass strip, run from connector to beginning turn of the helix for impedance matching. Space the point of connection to the helix about 3/16 inch above the ground plane reflector. Natural impedance of a helix is 140-ohm.
On air experience with the 432 helix was that a ten element CP crossed element yagi is better. But if you desire CP the helix is a natural, though not perfect.
73, Ed - KL7UW http://www.kl7uw.com Dubus-NA Business mail: dubususa@gmail.com