Depends what you need it for. To ward them away from you personally, carry it in your wallet or pocket- I'll sometimes draw it on my hand if I really feel a need for it. To keep them away from your house, you can post it on the wall, or if you'd rather not have it visible, draw it in chalk on your door (white-on-white), tape it behind a picture frame on your wall, or draw it on the underside of a rug. I've had trouble with them while dreaming or astral projecting, so I have one under my mattress. *Nim*