dude its really easy...assuming you mean it stuck in the up position.
there's 2 ways to fix the prob..

1st the easy way. take a rag and put over the top of the antenna, and lightly hit it with a hammer until it goes down all the way or almost all the way. this is what i did, and I can still pick up any radio station.

OR..if you want to Replace it, use that "certain tool" for removing the antenna surround, then open you hatch, take off the side paneling, remove the bolts and replace. and there way cheaper than $125, i suggest a DIY install, and save yourself some $$$.