Happy New Year to you too! ;)
Afaik replacing the wifi card does not help: in this thread we have folks with intel 6235 and Dell 1901 adapters with the same problems. So, I agree with you this must have to do with the antenna. Some Dell folks told me that apparently there have been changes made by Engineering. I don't know if they have been implemented yet though. Since you have yours machine only for four weeks I guess not. As soon as I have some further details on this I will post here. At that time I will try to get my machine replaced.
Hope this helps somewhat!
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