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A problem with PVC or any plastic pipe is the weight of the pipe will tend to make it difficult for it to be self supporting in the vertical direction.
I once built a coaxial co-linear antenna for 2 meter work and the smallest diameter pipe which would self support was 1-1/2 inch PVC.
Someone here once suggested using a fiberglass pole with the wire inside. The strength per weight is higher than PVC.
Maybe consider a fishing pole with the wire going through the loops?