I cannot help you with your Chevy. I can tell you what worked with my 2018 Ram. I needed a new shark fin antenna in a better location. I could only find the antenna and appropriate wiring harness through the dealer. I did find the wiring specifics online. I had to remove the cover on the passenger side front window pillar to plug in the new wiring. I made a magnetic base that would work for attaching the new antenna to the hood. Before replacing the antenna, I had about 70% function. Afterwards that went to over 90%. I still lose signal in some locations when the truck is pointed exactly north.