For someone who knows how to do it or who did this before, it is rather easy because the nylon line is not broken and you do not need to take the assembly out and disassemble the line holder to take the broken piece out.
You need a special tool to take the strainer on top off and let someone help you turn on the radio. Then the nylon line should come all the way out. Push the nylon line of the new antenna in and again someone turn off the radio. The motor will turn the mechanism to hold the end of the line and turn the line into the roller. It looks fairly easy to do, but when you do it first time, you might not find the way or "feel" to accomplish it in first shot. But I am sure if you try you will do it.
Confusius said, I hear I forget, I see I remember, and I do I understand.
Occasionally some after-market parts are a bit different for the OEM parts.
By the way I see many of my country people spend big money by luxury expensive cars but reluctant to spend some small money on maintenance and repairs.
Please don't have bad feeling on my above comment. It is not you special. I respect people who look at it closely and figure out about how-to and then do it DIY like a pro.
Hope I can help you more, and good luck!
