Newbie to Singal Increasing

I recently moved back to school in a different part of the dorm I lived in last year - I'm now three stories below and farther away from the on-campus Sprint tower by about 200 feet (or so). I currently receive one bar, at best, from my nearly two year old A900 from my window. This is frustrating as I'm a very active student and I can't afford to miss calls.

I've been looking into getting a signal booster. Which is the most cost effective? Which would you recommend?

Please help! Thanks.

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i'm having a similar problem

Honestly, signal boosters don't really do much good. At least in my experience with 'em.