I bought this product to try a give a little boost to my aircard. I travel on a mobile health testing unit and use my laptop in the back a lot. I placed this in the door window and it seems to have given me a 1 bar boost so it seems to work fine for me. I would love to get 5 bars where ever I go but I'm being realistic, this is a passive device after all, if you want more power go and buy an booster amplifier.