if you'll notice, the audio stops around 15kHz (limit of FM transmission system). All the junk above 15kHz has probably come from effects being applied to the recording after transmission - EQ, reverb, stereo "enhancing", etc. Notice the non-linearity of the spectrum after 15kHz... it's all artificial enhancement, I'd say. If it was on DAT, it probably was sourced from FM before that.
That audio abouve 15kHz is likely junk... try filtering high-pass at 16kHz and see what you hear. Won't be much, if anything, I'd bet.
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