Airband RX is poor at best, you must update the firmware to even get it to the poor level. The AGC on AM is all messed up, it overloads easily. I live about a mile and half from a major airport and I can barely copy the tower and ground coms. I have several other Chinese HTs that recieved the airband and they are really good, the K5 is not one of them. I have two K5's, both have different firmware installed and both exibit the same poor RX.I ordered one of these today. Of course, I see there are different variations. I have no idea which one Amazon is going to send. I'll need to buy a couple more for different uses.
My main motivation for wanting one is Airband. I've always enjoyed listening to Airband. Full HF receive will do nicely, too.