We have a little yard at the back of our house with my shed, I often walk to it barefoot, wondering if it’s helping but I’ve no way of telling. I have some good days, some bad but don’t notice any correlation.

Probably a more effective method in the city with no easy access to land, touching a copper water pipe should be enough to discharge any static build up. I’m not sure how a sheet would do it, especially if it has no path to earth itself.