I don't think there is a Drive in theatre open anywhere anymore. They closed one down where I use to live in California just about 3 years ago after they found the owner murdered. He was 85 and was shot to death.
We have a brand new drive in movie opening in my hometown soon! It's going to be very nice and will only show family movies. I can't wait to try it out and see how much of the original drive in is implemented. You know, the speakers and snack bar and such. This is being opened by a family that has had great success in other places where they have restarted this nostalgic trend.
The last one I remember in Miami was the Dixie Drive in and they finally closed it in the late 60's. It sure was another world back then, you could actually go and have a good time and not get mugged.
We've just recently had one open here bringing the local area number to two now. I understand that you tune your car radio to a certain frequency to the receive the audio portion. Haven't been and will make no promises.