Why does my iphone barely pick up my wireless internet?

I have Rogers wireless internet and an iphone 3Gs ... I'm sitting 5 feet in front of the modem/router and sometimes I get full signal, other times I get barely any and half the time it drops off completely. My netbook connects to the internet just fine and it never drops off. Does the iphone just suck at picking up wireless randomly or is there something wrong?
 
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