you need to shield your cables better or connect them to a filtered power center/strip or read at bottom. just because it is monster or whatever doesnt mean that it has filters on each input that block out extra noise. if the station is fm, it will be harder, if it is am you can make sure your cable is not looped anywhere. i doubt much will help more than moving the amp or somehow shielding it, because more than likely IT IS picking up the signal and not the cabling. but i would check cabling first. try disconnecting everything and reconnecting.
so if i hear you right, with just the amp on and nothing connected to it, you get the station?