A little late to this thread and I'm not interested in speculating or laying blame but I'm honestly surprised this does not happen more often. I fly out of a very busy non-towered airport where, my experience tells me, everyone is great about using the radio. The radio is helpful but, it's simply really hard to locate other aircraft visually during the workload of a landing or the workload of the traffic pattern. It's exceptionally hard to find other planes when, often, even when using the good intentions of radioing in there positions, pilots use absurd position reports like "entering the downwind" and then expect everyone to just magically know where they are entering. Another absurd position report I hear all the time is, " on the 45." Great! Are you 10 miles away on the 45 or about to turn downwind??? The truth is, these phrases we are all taught are absurdly antiquated in today's day and age. People have GPS's on board that tell you to the tenth of a nautical mile, with great accuracy mind you, exactly where you are in position to the airfield! The best calls I ever hear at the non-towered field I fly from is the guy who says, "I'm 3 miles NE of the airport planning to cross mid field over the runway to enter the left down wind for runway 33." Then he says "I'm crossing over mid field now at 1,600." My point here is, let's all help each other out and be as specific as possible when reporting positions.