Poor MacBook Pro Airport reception?

Just upgraded from a 12 inch PowerBook to new 15 inch MacBook Pro - and my Airport signal strength has crashed as a result. Compared to the PowerBook reception is now so poor that I often have trouble connecting to the Internet at all. Signal strength showing on MacStumbler with the PB was generally about 75, it's now (using iStumbler on the MBP, because it's a Universal app) at 50. Is this a known issue with the MacBooks, and is there any solution? Or could it even be a problem with the specific airport card that's installed in the MacBook?
MacBook Pro 2.0 x 2   Mac OS X (10.4.6)   1GB RAM

Hi,
I am having the same issue with my iBook G4, it has terrible airport reception, however I am using an airport extreme card which I installed about 2 years back when I got the iBook.
My boyfriend gets excellent reception on his (PC) laptop but using MacStumbler signal strength is only about 25-35 on my iBook.
Other factors:
The reception is just as bad for me on other networks (for example at my boyfriends house I have to virtually sit on top of the router to get reception and even then its dodgy and drops out all the time.
I have removed the Aiport Extreme card, cleaned it and put it back in and re-connected the ariel cable.
I have downloaded the latest software updates.
I have 2 routers (in a 1 bedroom flat!!!) I thought this might improve things, so I have a Belkin (I think) wireless modem/router in the hall AND an Airport Extreme base station in the living room acting as a bridge. Not a great deal of improvement was seen.
I have an iMac G4 in the living room also and the reception on that is fantastic.
Can anyone help or have any suggestions?

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