Well, we hear it all the time in CW form. We'll be in a conversation and hear a faint but consistent CW key in the background. Sometimes it's on frequency, others it's in the background. Sometimes it's flat out annoying, particularly when it comes out of nowhere unexpectedly. I have a dipole that I use on multiple bands, connected to an antenna tuner. When I change bands, I need to tune my antenna to the new band, but I want to do this in a way that is within legal parameters and so that it doesn't affect others in a negative way. It seems that there's no way around having to tune an antenna this way, unless one owns other expensive equipment I suppose. Would this be within legal and ethical means prior to transmitting during this process? 1) Check to see if the frequency is in use, either by means of CW or phone. 2) If all clear, send out the call sign of the station performing the tuning, either by CW or phone, before and/or after transmitting. 3) Transmit on the lowest power setting, unless more fine tuning is necessary. 4) Carry it out in as little time as possible. More often than not, at least when I'm listening, I hear this tone without the station identifying themselves. It's very common, but seems that technically doing so goes against FCC guidelines. As far as checking to see if the frequency is in use, this seems more of a common courtesy, but even in doing this, sometimes I imagine the tone will bleed over to other frequencies. Instead of using CW, would a silent AM keying be more acceptable? The lack of tone may seem that way, but then more bandwidth is being used, potentially causing a more widespread disturbance. There are different opinions out there, so I just want to be clear on the proper procedure for carrying out this process. Thanks in advance.