I have a 2013 wrx sedan I purchased a all new audio system for it.I have xm sat. Tuner and ran the antenna wire to the back like I have done on other cars I've owned I want to put it on top by the factory fm antenna but don't know how to run the wire through the gasket material on the back window or is there some other place that is better than others? I've mounted it on the trunk lid right now but looking for something different it doesn't get good signal down there. I wish xm would come out with something different than that. Any jelp would be appreciated.