I did try this collinear antenna design as mentioned in this post. Can you confirm your design is for a 5/8 - 5/8 - 1/2 wavelength collinear antenna. I would like to know what your performance tests show. You mentioned you changed the dimensions, what lengths did you use and what is the diameter of the loop?
I found out that regular water pipes are bad for RF. However a waste pipe which is much lighter works very well. Those are quite transparent to RF.
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