Satellite Radio install for our C, a few questions...

I dont know for sure as I am contemplating the same thing for this summer. One guy recommended just getting the marine antenna and leaving it on the dash, said he had no problems with that? You can get the outside antennas pretty cheap to plug in my kids told me, I have plans to just use the unit in the different vehicles we have so t will either be the marine antenna or several of the mag mount ones from like ebay. Dont know why they would not work just as well on the wiper cowl??