well ....i think its mainly ur guitar ...especially the pickups......if ur guitar has single coil pickups....there is nothing much u can do to do eliminate the humming.Well Mine did and i tried shielding it and a lot more other things and it didn't work....there r ways to lessen it...if ur guitar have a 5 tone selector ...use the 2nd and 4th one ....this will use 2 pickups instead of one thus lessening it....
the other way is to cut down on the treble on ur amp setting.If u got the dough....buy a noise suppressor but wouldn't recommend that.....Lastly, the best thing to do if u could cough up a lit bit of cash ...u could buy a double coil pickup....u could do the wiring and stuff by urself and its quite simple....it'll save lots of money and also get rid of the problem...well that would be my advice because that's wat i did...u'll get better sustain and the sound will be more powerful.....enjoy!!