You just need to re-terminate that antenna cable with a new connector. They’re a few bucks at Amazon, or go to the car stereo department at Best Buy or Walmart. It’s a $10 problem at most.
Metra 40-UV40 Standard Male Antenna Plug - 5 Pieces/Bag https://www.amazon.com/dp/B0007WW66C/ref=cm_sw_r_cp_api_glt_fabc_1562BXQ427BC66J58P1B