I'm sorry. But it was funny.

Why and What did they cut outside your house? When they cut it did they hook the ground back to whatever it was supposed to be hooked up to.

Like Ernie said, we need a bit more information. The only thing I could think of off the top of my head is that you have a digital cable box, that digital cable box has a phone line installed into it. That cable box is also hooked to your A/V receiver. For some reason it is affecting your AM channel. But that is off the top of my head. We need more info.

But I think it would be something to do with the ground.