SP, You probably wont find a wireless device that is capable of 400 feet for 20 bucks. It would be line of sight, so trees would knock it out. Wind won't have any effect. Rain and snow would, so would someone standing in the way.
Pretty much everyone mentioned to call the Sheriff, and there seems to be a delay!
I had a few nephews your age, and they tended to pile on the BS in their younger years, saying stuff happened, when it did not. They are older now, and respect things on the side of facts.
