It gives me a 12-18dbm boost. But my device in the cradle was getting so hot that it would overheat and stop charging and then die. Well, I noticed open air vents on the back of the cradle and seen a usb out so i decided to buy a 40mm usb fan. I ran rubber bands around the top to bottom to hold the 40mm fan over the vents to blow air inward and plugged in the usb and the device now is always cool/cold to the touch and my device always stays 100% charged in the cradle. But places where I got 3 bars of 3g im now getting 3 bars of 4G Lte. I haven't tested the supplyed antenna as I have a 24 inch antenna I use as it is very strong at keeping signal out in the corn fields... lol