In this video, I bought the Cobra 29 LTD Classic and GH A1500 antenna together from Amazon.

You connect the positive wire from CB power cord to an ACCESSORY fuse, and the ground wire to a non-painted metal structure.

You will have to adjust the SWR on your antenna by cutting it down in length; I took about 2 inches off.

Find a way to run you coaxial cable from the
antenna to CB, but be careful because it can damage easy. Running it through your door jam is not best. In my case, my hatchback has a gap for it.