Take a police scanner and see how far below and above the band it goes. If you have a portable one, walk around your neighborhood for a few blocks to see where it stops or gets less, or more. If it is really strong across the whole spectrum, you have probably found the source. Try to use a high sensitivity receiver to detect it.
I have seen leaky cable poles, Uverse boxes, transformers, tanning beds, wall warts from China with no insulation, Plasma TV's, florescent lights. It can go on and on. I have seen it miles away in a directional signal path. In your case it sounds close by since it is demolishing a large swath of your FM band.
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