[Antennas] Elevated Radials

[Deon Erwin ZS1ZL]

I have a HyGain AV-14AVQ trapped vertical for 40-20-15-10m and plan to
install it on my house roof.  I understand the manufacturer's radial
requirement of a fanned layout, but I wish to reduce the visible impact of
the "wires in the sky", as my wife calls it.

The specifications call for two radials per band and I can increase it to
four radials per band by cutting them from insulated wire and cable-tie four
bundles of 40-20-15-10m radials.  The effect would be that there are only
four "thick wires" visible.  I tried this before at a different installation
and the antenna seemed to work well.

What would the effect be on the efficiency of the radials when the four
different radials are bundled together?

Regards
Deon ZS1ZL