Shouldn't have a point on a tinfoil hat as it acts like an aerial and attracts the CIA's mind control waves. Need to use at least three layers of Turkey Bacofoil (thicker and stronger so blocks waves better) on a flat or curved surface to help reflect them.
I can flog you some made up, err I mean carefully researched, designs, with free magic beans for a very unreasonable price
Remember you're not paranoid, they are after you