I don't know of any Low-VHF only antennas, although I understand that the larger ones (usually made by Channel Master, R.C.A., and Winegard) have long dipoles near their ends that are designed to receive low-VHF channels. Rabbit ears still seem to be readily available, although I assume indoor reception would be a problem regarding the effects of impulse noise on the low-VHF signals since they would already be weakened by the exterior walls.
I'm also not sure if there are any ways to improve gain. I don't imagine that the corner reflectors seen on U.H.F. antennas would be practical as they would be rather large and cumbersome, so I would assume the only way to improve gain for the low-VHF channels would be to add more parasitic elements/directors.
I hope this helps.
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