suceress, an amplifier probably isn't needed if you get an acceptable signal outside. I don't get a very strong signal inside either even though all the wireless carriers have towers within a mile of my house so I put an antenna on the roof to use for all my wireless needs. After trying several different styles if antennas with less than acceptable results, I found that a Wilson Electronics Dual Band Trucker Antenna works very well and they only cost about $30 on Amazon. I got one with a threaded base and mounted it on a magnet mount and stuck it on the roof but you can also use a clamp on mount. It comes with about 20' of lead in cable attached but one drawback of the Wilson is they use their own proprietary FME connector on the end of the cable so you have to get a matching pigtail with either a connector on the end to match your device or a flat pad to place on the outside. The pigtails are available on ebay to fit just about any device however. I got an external pad to use on my Blackberry since it doesn't have an antenna jack but it works on the Sprint USB device too just by sticking it on the outside and gives me a full 5 bars.
»www.amazon.com/Wilson-El ··· 06VSHE4/