"Buzzing" Around 95.7 & 101.1: IBOC?

[Kaimbridge M. GoldChild]

I first noticed it a fair while back at home (Beverly) on 95.7, but
presumed it was just locally (house/neighborhood) generated electronic
interference.
Then over the weekend I brought my Sony WalkMan home from work and, on
the way home, scanned the dials and noted the same interference in
Boston and thoughout the Commuter Rail ride home, wherever WZID (95.7)
and WGIR (101.1) Manchester NH came in.
Its not the typical high-pitched buzz that the other, local FM IBOCs
use, but rather a low frequency buzz, that's usually caused by power
line interference.
Anyone up in the Merrimack Valley/Southern NH area notice it?

     ~Kaimbridge~

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