It would likely be faster to simply run by a Radio Shack and pick up a 15-0024 FM Filter and give it a try. Don't loose the receipt, just in case.
As noted, FM intermods in the UHF band are pretty rare and you'd have to be quite close to the FM signals. I can see that there are several potential FM stations in your city that might cause these problems, so just trying the filter would be worth it.
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