In the Raleigh-Durham market, we used to be able to near NBC programming on 87.7 thanks to WECT-TV 6 in the next-door Wilmington market, a unique convergeance of physics, allocations and affiliation that allowed you to hear NBC Nightly News or SNL if you weren't home in time...at least until 8/8/08, when Wilmington became the nation's pilot DTV market.
Their analong tower, the tallest in North Carolina, sits close to Fayetteville, in the market's southern corner, but you could still near the WECT audio even in places where you couldn't regularly see them on TV. After 8/8/08, 87.7 was just faint, occasional CBS audio from WTVR-TV in Richmond until 6/12/09. Now, save for Raul's ramblings from Havana occasionally in the summertime E-skip season, 87.7 is silent.
WECT took a major hit in its out-of-market coverage area with the switch from analog to DTV, though parent company Raycom started an NBC affiliate in one of those affected areas the same day, WMBF in Myrtle Beach (WECT and another Raycom station, WIS in Columbia, had served as the Myrtle Beach-Florence market's de facto NBC affiliates prior to WMBF's sign-on).