As long as you are north of the equator and, have an unobstructed view of the sky, and power going to it, I couldn't imagine that it wouldn't do what you'd want it to.
It should work. I drive a 2019 ford transit van and it has a auxiliary audio jack on the dash and it works just fine in it and you can always have best buy install it
Yes. After installing the device. You can stream your Xmradio signal trough a certain frequencies on your radio. In case your aftermarket radio doesn’t have Bluetooth.
Depends on the antenna plug. If the existing antenna has the same plug connector as the one for the new unit than yes it should work. If not you can check online for an adaptor.