It is near Tenpenny Tower. Note When Playing In The Area -
This is a popular location for suicide bombing. First, save your game. Then, all you have to do is get within a close to medium range of the drive-in, pull out a Nuka Grenade and run in. Then you throw the grenade into a gap between two cars while avoiding fire from the raiders, jump up on a car and watch as your corpse is thrown a massive
distance into the air. The raiders and the guard dog will undoubtedly be killed in the immense resulting explosion. make sure to take off your armor first to avoid surviving the explosion. There is a small chance that Allistair Tenpenny may shoot a car during one of his "wasteland safaris", taking out the raiders, mines, and any other nearby vehicles. There are at least 7 mines you can harvest along the road leading into the Drive-In. There is a Raider base in the caverns north of the Drive-In: Cliffside Cavern. One entrance is to the north, in a dip in the ground, with a hard locked door; the main entrance is to the west in the straight direction of Tenpenny Tower, not locked at all - but probably guarded. If the picture at the top right is observed closely, specifically the blank screen, you'll see a refrigerator lodged between the blank screen and the ground. There is also a chair sitting on top of the screen with what looks to be a bottle of whiskey sitting beside it.