Planning to replace a broken antenna, but in the meantime???

I have a Gen III Prius, and I noticed that the antenna is broken; I'm talking, half way cut. To be blunt, I don't know how it happened, and I've always cared for my car (no scratches, has never broken down on me). I've been super careful with driving it around especially where I go to college. Side body moldings were worth the investment because I've seen so many dinks on other cars.

So what I did to hold it in place was using scotch tape (the super sturdy kind) around it twice so it wouldn't bend backwards and break.

Anyways, I'm going to a Toyota Service Center on Tuesday to fix an oil maintenance problem, so I will ask them to fix the antenna too. Does anybody know how much it will cost to replace it? I'm super worried the wind or rain will rip it off from the roof of my car when I'm driving to school tomorrow..

Got tips? Or someone with positive things to say?