Correct. The (non existent..) NDB operates between MF and VHF. And about TACAN/DME having a corresponding VHF frequency?
Which is all irrelevant to the facts. There was a mountain in the way. When you can't get NDB, TACAN, VHF radio or expected radar coverage, SURELY someone might think 'hmmm what is there around here that might possibly be blocking a signal from the ground based equipment? Surely not a huge fkn mountain..'
