Radio interference with guitar amp!?

Since the day I bought a electric guitar I have had really bad radio interference with my amp my first amp I ever bought was a cheap fender amp and I thought the rf was just happening cause it was a cheap amp so I bought a vox v15 and I still have a humming and rf coming through so I bought a ferrite choke cause I was told it gets rid of radio interference but it didn't change anything. it can't be my guitar that's the problem cause even when it's unplugged you could still hear the radio. My guitar is a les Paul epiphone 100 also I was wondering if a spider jam line 6 amp has something to block out rf?