[Moderator note: Moving thread from Motherboards to Wireless Networking. More applicable category.]
Update your post to include full system hardware specs and OS information.
Include some additional information and details regarding the network problems that are occurring.
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To answer "change my antenna" - probably not.
Not a matter of "better" per se but understood in general. Quality of design, materials, assembly, and supporting drivers being part of it all as well.
For the most part, the limit is the transmission power of the antenna which is set by regulation.
Reception generally being the "easier" part of it all.
One thing to try is to use an antenna extension cable to move the antenna up and about.
Or maybe a USB Wifi adapter with an extension cable.
Another option perhaps being to use a different wireless frequency and channel that is not being used or being used less by neighboring networks. You may need to coordinate any such changes with apartment mates.
There may be other ideas and suggestions.