sharkfin antenna

Hi. I’m installing this in a 2017 Challenger that does not have XM, and doing the head unit upgrade. The antenna has two lines coming out of it. Anyone know if they BOTH need to be hooked up? If one is XM what does the other line do? Thanks

Guys/Gals; Bought from Dodge Parts Store | dodgepartsstore.com. Since it is an electronic part it cannot be returned nor exchanged. FOR SALE: Sharkfin Antenna part number 5NU67LAUAB - Granite Crystal Metallic. Received today and it is the wrong color for my car. Never used. Original cost is...