You can run class c but to do it without creating much distortion it needs to be ran a lot lower then the rated watts of the transistors. I have got some class C stuff to produce a nice clean signal but there was some trickery involved. Back in the main topic those Mauldulators work well with class C amps because you can adjust the negative percentage of modulation to overcome the class C amp trying to cut off that part of the cycle. Technically its not HiFi but it does work if you do run class C. I say you befriend your neighbors, neighbor. Build a scud, I have built some from some remote control car controllers. You can install CB channel crystals in them. Install the said scud in your neighbors, neighbors garage with a wall wort and hopefully the signal will be weak enough by the time it gets to your house so you can still enjoy the radio.