First off, if you don't have XM or Sirius, get it. It's awesome.
So anyway, I have this little magnetic intenna thingie to install. Right now I'm just running the wire for it over the dash and out the drivers door and it's stuck to the top of the roof. The door just closes on the wire. Works fine, just messy. I'd like to run it (the wire) through the firewall and mount the little antenna (about the size of a silver dollar) right in front of the windshield on the hood. I've never run a wire through a firewall. Anything I should know about this? :-)
Thanks!
-jeff