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Hi , I`m JackPerhaps I can help you with this problem
I`ll start by saying that no matter the age of the antenna , if it is in good shape it will receive signals just as wel as so called "digital antennas "
You are saying that you used to get only one VHF channel ?
Did the antenna position change ?
It could very well be your antenna that went defective on the VHF part of it but it could very well be your TV's tuner as well in which case I could suggest an external tuner .
You don`t happen to have another tv that you could try on that antenna do you ?