After a lot of abstractly thinking about searches over sea I got to thinking about how radar works. It turns out that radar is essentially radio waves emitted with a measured response that is a reflection.
Now, what else reflects EM waves? Faraday cages! You can see a Faraday cage in action on the door of your microwave, the mesh is tuned to the wavelength of radiation to prevent it passing through and harming you.
My reasoning is that, a spiral of metal should not be that far removed from a grid of metal. If a grid can interfere then so must a spiral, especially when the wavelengths used range from 1-10m.
Some inspired searching later I've managed to find a paper that studies the possibility of searching for an infinitesimal metal wire using radar which would suggest that it is entirely possible for a metallised line to create a radar cross section.(http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1338286)
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