I'm new to LiveATC but have listened to air traffic for years over the air. I'm located about 20 miles Southwest of Logan and I hear most of the aircraft on approach but obviously not ATC. I'm impressed by the quality of some of the feeds and I'm curious how they are obtained. Some sound like a typical home installation at a location near the airport, and some sound like a direct feed from ATC.
For example, Boston Logan South Approach on 120.6 not only has excellent audio quality from TRACOM, but all the aircraft sound excellent as well. My guess is that this is a professional receiving station, or a feed from the Boston TRACOM in Merrimack, NH.
To add to the mystery, sometimes when I listen to the feed I only hear the controller not the aircraft. It's almost as if the feed is purposely blocking the aircraft audio. Thanks,
Steve