WiFi doesn't work great in Mac Book Pro

Hi, since I bought the MBP 15' (i7) last summer, I've had a lot of problems with Airport (Wi-Fi).
My computer first had the verion 10.6.3, as it doesn't work correctly, I decided to update to the next version. Now I have the last version, the 10.6.8
I would like that someone could tell me what to do, because I've been changing the channel of the router during all the year, but the problem goes on.
I also thought about updating to Lion, but programs that need Rosseta (PowerPC), won't be able to be used in Lion and I prefer to use Snow Leopard, because Lion seems slower.

Go to system preferences, then go to network. Then press location, edit location and name a new one, for example test or something. 
Under Wi-Fi go to advanced and under the folder TCP/IP, then renew DCHP Lease and press ok.
You should be good to go now.

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