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Sounds like SWMPS noise. Any new electronics in your home lately such as wall warts, Computer power supplies non-incandescent lightbulbs, etc? If so unplug them, and see if it goes away. Another option if you don't know is to turn off every breaker but the one your radio is on (make sure you know every device powered by that breaker) and see if the noise goes away. If it don't then the problem is either on the breaker that feeds your radio, or a neighbor's device that is radiating.
If it is a neighbor's see if it comes and goes at different times of day and observe what lights come on and go off. You may be able to track it down and convince them to stop using it.
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