Yep, that half inch cable with a thread goes to what should be a 1 1/2 squard box. the window should have 4 small dots in a square where the onstar box would go. If you dont have any tint on the window, if it is cold outside, I'd advise using a heat gun to heat the window in that location up to nuke warm to the touch, Not hot, then apply the attenna. Ive had to install cell phone[bag phones] in cars before, and found a problem with just sticking the attennas to the windows, if the climate outside gets below like 55 at the time of application. Thats just me tho. depends on where you live.
M1114 Up-Armored Hummer [Battle-Taxi]
Not able to keep soldiers safe against explosives.
*Combat tried...Combat Failed*
2002 SSEi Modded "Dirty Ghost" [Stored]
*Deployed OIF 06-08*
RestInPeace Chad You gave your Country the Ultimate Service and Sacrifice