After deciding to look at the link, it gave me no real info on the limits of a AM transmiter other than the operating freqency. I have been able to find out tthat the field strength is more important than wattage. I believe that the field strength can noot exceed 250 millivolts at 3 meters/10 feet. You would think it would be quite easy to find the limits of a unlicensed radio, but it isnt. I think I will build it any way. Im not going to use it as a mini broadcast station. I will build it make sure it works and put it on a shelve thats about it.