I've used them with great success at 435 and 2 m.
Go to:
http://tinyurl.com/wb6lloOscar
and see quadrifilar antenna articles...happy to answer any questions..
Follow dimensions carefully on 435..
73, Dave, WB6LLO
dguimon1 at san.rr.com
Disagree: I learn....
Pulling for P3E...