This mod has had varied success due to the variations in the materials and methods of application, skills and knowledge of the installer, and to some extent the severity of the inherent interference from quad to quad.
Thought there are pros and cons to any solution, including materials chosen, the success or failure is not with the material (copper, aluminum, etc.) per se. Both Cu and Al are equally effective. But since aluminum has only 50-60% of the conductivity of copper, a thicker gauge of aluminum would be needed to achieve the same shielding effectiveness as copper in any given situation.
So just how much is needed?
There has been no 'published' experimentation with adequate controls to either characterize the interference (frequency(s), amplitude), the mode of transfer (conducted, radiated, or combo), or the optimum size and shape of the shield.
The good news is it's easy to see if a given application has worked by comparing before and after SV counts.