For any other PCB design tool, creating a custom-shaped board is simply a matter ... Fritzing is a tool you should avoid for PCB layout. That said, [Arduino Enigma] figured out how to do something ...
Fortunately, there is e.g. a free KiCad library with ready-to-use PCB antenna designs to help one get started with a custom design, as well as many other resources, covered in the article.
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