Helical-wound radials for vertical antenna

[VK4WDM]

I am trying to fit a 4 band HF vertical into a very tight space. It is mounted on top of a 5m high pole. I was going to use 4 elevated radials but there is no room to fan them out. My thought is to helically wind them on to a pieces of PVC pipe attached to the base of the antenna.  I think there are some commercially-built verticals that have similar radials (CP6?).

What say ye!

73

Wayne VK4WDM