Cellular Booster Antenna

If you are wondering that your cell phone signal drops every time you take a subway or your location is between those high rise building, then you need a boost. Do cellular booster antenna really improve cell phone reception? There are sticker cellular booster antenna that according to some claims that shown amazing results in increasing the signal strength of a cell phone. Interestingly, it worked through using an external antenna that absorbs the signal from an interior repeater. It seems not very popular but if you want to learn more, you can checkout some online forums and reviews to validate the claims.