Audio taping neighbors?

Question

I have a neighbor and she has video camera on her house andi heard that she also is taping audio. It’s that illegal if no one in the neighborhood knows i live in New Hampshire

Answer 1

very illegal as it is invasion of privacy, well it is in u.k. i would assume it be the simular in the u.s  

Answer 2

its only legal if she is taping other people without their consent. If she is just taping her personal property then it is completely legal

Answer 3

as long as its only taping he private property and/or public open properties then its legal. If shes spying on houses or watching neighbors then its not