Creating a custom part is necessary functionality of a PCB design tool. The first PCB design tool released for the PC had this functionality. Without the ability to create custom parts ...
PCB design and layout services generate schematics and computer aided design (CAD) files for printed circuit boards (PCBs). They produce industry-standard Gerber files and provide fabrication and ...
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.