Actually doing the roof mount was fairly easy. I was reluctant to do it, bit figured I woudl try. I am sure XM is like Sirius, they kit comes with the puck antennea, an extendion cover to cover the first 6 inches of wire so the puck can be placed up the roof a bit then the wire for mine was 21 feet, and beleive me I needed every inch. The tricky part is getting the wire under the rear window rubber gasket. you will need probably a small flat baded screwdriver and then wither another small screwdriver or I used a stiff pair of forcepts. You essentially use the blade to wedge under the gasket aheads of the wire to pry up the gasket and I used the forceps trailing behind the screwdriver and wire to push the wire under the gasket. Patience and slowness make it easier as the gasket is thin and the width is small so it is easy to accidently jam the gasket below the wire. I brought it down the right side of the rear window and then brough t it in the trunk about 4-6 inches down the right side of the truck. I tucked the wire behind the cardboard/fabric liner on the right side of the trucnk and through the fold down seat near the floow of the truck. You can reach underneather the rigt side of the rear seat to grab the wire as you push it down the back half of the folded seat. I then tucked it up in the plastic door sill molding along the floor all the way to the front corner uner the dash and then tucked it behind the top edge of the carpet that gous up under the dash in the passenger area. The tuner is under the pocket in the center console. You have to remove the center console then the 2 screws that hold that deep covered pocket under the climate system and remove the pocket. I had to engage the car and shift t out of PARK to get thepocket out, You should see the tuner laying there or taped to the ducting. The Sirius tuner used a standard jack that was compatably with the antenna I bought. I got the Sirous antenna at Best Buy for $36. The instructions with the antenna were very simplistic and vague.