I have given it 4 stars as it has enabled me to use a phone card for my laptop most of the time where as prior to installing the unit, the card would rarely pick up a signal.I would not give it more than 4 stars as it has a design feature that makes it less useful than it could be. At my location, there is a strong AT&T; signal and a very weak T-MOBILE signal. I need the unit to boost tha T-Mobile signal but the strength of the AT&T; signal prevents me placing the external aeriel in the best receiving position as this boosts the AT&T; signal above the limit that the unit is designed to handel, thus limiting the relayed signal strength.