This product exceeded my expectations.I had signal problem in a high rise building at 9th floor and did some research in internet if there is any existing solution and came across this product.I put the antena in the window as its all glass door with no access to outside walls from window.Before this product I had to stick myself to the window to use cell phone or use landline.Now I have the luxury of talking on my cell phone while sitting on the sofa or on the bed.Go to the manufacturers website before you purchase to pick the right type of product depending on your carrier and the frequency.Some of the negative reviews here might be because of selecting the wrong frequency product. Installation is as easy as counting 1, 2, 3...