It's one of those things you know in your heart isn't going to work.  However, before I invested in a $100 + to boost the cell signal in my office I was willing to invest the buck and a half just to prove to myself that these things don't work.  Well turns out EVERYTHING you read is true.  They don't do a darn thing.  I have to admit the buck was almost worth it to read the horribly translated English direcions though.  "Make sure you don't leave gingerprints."