My guess is that the antenna would work better than one with no radials
but poorer than one with proper radials. The only answer is to try it
and quickly before a car runs over it. I wonder at the effect of no
radial being at the correct length and the possibility of harmonic
generation caused by the reinforcing wires. Note that broadcasting
stations tend to use 180 quarter wave radials spaced at 2 degrees to
get maximum efficiency. If you could somehow lay 8 quarter wave radials
on the ground it would give you a basis for comparison.