I want to start listening in on Air Traffic in my area. I fly a good amount within 5 miles of a class E airport that is not towered. In certain circumstances I would really like to listen in for general aviation activity in my are. I know how to look up what the frequency I need to tune to. my question is what type of handheld unit does anyone recommend? I only need a receiver I think if I just want to listen. Brand and model or any links to anything would be appreciated, thanks.