Tin foil? Haven’t heard that in years.
Really aluminum foil, but everyone calls it tin foil these days.
Actually, any kind of sheetmetal “hat” on the antenna renders the GPS blind. Of course, NYNY could be cheaping out and using cell phone based tracking instead of GPS, and the tin foil may not be as effective, thats where the wire cutters (known as “dikes” in the trade) come into play.