That antenna lead is hacked and hacked up badly. This antenna line is a shielded co-axial line that must maintain the integrity of the shield between the antenna and the car radio to have any chance of decent reception. The inner core, inside the white insulation, carries the antenna signal, while the braided copper shielding, negative ground, shields the inner core wire from electrical interference from all the other electrical noise inside the car. With the shield breached, noise can scramble the radio signals, giving bad reception. The cheapest fix is to properly splice the lines. The best fix is to run an unmolested line from the antenna to the radio, but would require a good bit of skill to do correctly if the antenna line at the antenna is built-in, not a quick connect.
This discussion has some great ideas to properly splice the line: forums.corvetteforum.com/c4-general-discussion/1504486-can-you-splice-antenna-wire-like-regular-wire.html