I've one CPE TL-wa5210g configured as client, it's mounted on a tripod at the window of my room,

it's power i setup at 10dbm (the minimum) 

I'm using it to get hotspot of my neighbors house that's 120 yards ahead of my window. and there are another house in the way.

it's working great for me, but I'm afraid of breaking any FCC rule, or if it's illegal to use this way.

So what kind of problems could i have, using it this way?

Thanks for your atention.