Physic geniuses: I need your input on the use of a Parabolic Dishes

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Ok, I know they work like sonar, but what I need to know is:
-Can you use it inside a house, point it at another house and hear anything? No, I am not going to eavesdrop on my neighbors.
-A friend of mine said, no, the dish must be outside and be pointed straight at a window within a range of less than 300 feet to hear anything even faintly, and the window must be single paned.
-Yet another fellow said he used one in his apartment and did eavesdrop on his neighbors on the other side. Not a nice thing to do!
-And finally, can it be used while in a moving automobile?
#eavesdropping #parabolic dish #sonar

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