I remember the days when if there was the slightest increase in noise or drop in modulation on an AM signal an engineer was dispatched to the TX site to fix it - within the HOUR.
I remember one day at KDWB when a filament supply tripped a breaker in the main TX and the station had to operate on the 1kw aux for about 20 minutes in midday. (This was 1974.) GM Gary Stevens was about ready to pop a major artery. When I found the problem and reset the breaker you'd have thought I had cured cancer, from the warm kudos I got from management - this was over a decrease in AM coverage amounting to probably 10% maximum, for less than a half-hour.
I know it sounds curmudgeonly but I routinely hear signals on the air nowadays - AM and FM - which would get the engineer fired ten years ago.