WLFGDT in Gundy, Virginia has four "virtual" sub-channels, 68.1 through 68.4
 

WLFG in Gundy, Virginia which was originally analog went digital after their analog transmitter failed. TV Fool lists WLFG as...

WLFG (Digital)
Channel: 49
Network: Independent
Maximum ERP: 45.000 kW
Coordinates: 36.829831 -82.079019

You may want to expand the TV Fool database to include the WLFGDT Digital "virtual" sub-channels - Channels 68.1, 68.2, 68.3, and 68.4.

The failure issue is somewhat confusing, but Wikipedia (with some sources?) notes that...

"WLFG shut down its analog signal, over UHF channel 68, in May 2007. The station's digital signal remained on its pre-transition UHF channel 49. Through the use of PSIP, digital television receivers display the station's virtual channel as its former UHF analog channel 68, which was among the high band UHF channels (52-69) that were removed from broadcasting use as a result of the transition."

Regards,

jan3

Additional sub-channels are not a part of the TVFool database. The "68.1" can be entered to show the virtual cahnnel number.

The 2007 failure is irrelevant to the database since ALL full power broadcasters were required to cease analog operation and convert to digital in 2009.