Thanks! I ordered it from visualgarage. they don't have the grand cherokee listed on their website, so you just have to email them. They were great! They got back to me right away with a paypal invoice, and i had it in about a week and a half.
No not at all, it's really easy. You just unscrew the stock flip antenna part and the sharkfin installs right over the black base that is on your roof.
Reception's good. I usually always listen to satellite and it sounds perfect. I tried FM also and sounds good, no static or anything. I didn't have any problems with the stock antenna or the chrome one either though.