Crazy shark fin antenna project which not worth it

Price in Malaysia Ringgit (MYR). This shark fin antenna from Perodua Bezza, local Malaysian car manufacturer. www.perodua.com...
You might think this is not worth it, actually you right. This project took me about a month to complete. I only did it after work or weekends. If you keen to use same like mine, you might consider it as following:
1. Enquiry buy without internal antenna, just top case and bottom case.
2. Existing antenna for internal necessarily, I used previous shark fin antenna which I bought it from lazada.
3. Exterior 3M double sided tape required.
4. Ask car shop to paint it.