Try that link I posted above. If you want to try just the cap, go to Radio Shack and get the one pictured on the link, and connect it across the power cable as close to your radio as you can get it, and observe that the capacitor has polarity (put the + on the correct side of the power cable, iow.) See if the noise disappears. If it does, come back here and I'll talk you through installing it permanently.
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