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I've got an older "boom box" that has that problem with locals. It does really well with more distant stations (in my case FM) but I cannot use it above ground on many of the locals. (6 miles from downtown Columbus). Everything clears up nicely when I take it to the basement.
You might experiment with grounded shielding of some sort -- hardware cloth, sheet metal, etc. to see if you can locally attenuate the signal in the bedroom.
If it has an external antenna connection, maybe try that with no actual antenna connected.
If you have amateur gear antennas, any chance of them capturing and re-radiating the signal? That's kind of out of my league, but is might be a stealth cause of the curiously high signal levels.
Chip
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