Well, yes, if I compare that to the format of an existing file, e.g. the us-MI-Lansing one I copied:
# initial tuning data for Lansing, MI
[CHANNEL]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 617000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 695000000
MODULATION = VSB/8
INVERSION = AUTO
[CHANNEL]
DELIVERY_SYSTEM = ATSC
FREQUENCY = 719000000
MODULATION = VSB/8
INVERSION = AUTO
... and so on. So that may well be the issue - but I'm only guessing.