Just to confuse things, in a probably rare(r) usage, "a holler up the road"¹ is a distance - about as far as you can hear one holler.

"A hop an' a holler" is a little bit further than a holler away.

"A skip an' a holler" is wee bit further than a "hop an' a holler" but not quite a "holler 'n a ha'f ."

¹ In a usage heard a few times ca 1940 - early '50s(?) neighbors described as "lives a holler up the road" implies nearby - and "friendly," i.e. a neighbor you'd holler at (visit with) occasionally. In this usage, as I heard it, there was the implication that you did visit with them occasionally.

Possibly briefly, "gimme a holler" meant call me on the telephone, which - given the voice quality of some of the REA Co-op phone systems was a lot like standing out back and trying to be heard a quarter section away. This usage seemed to disappear when the "crank phones" faded, since talking on the phone in normal conversational tones just didn't fit with the expression.

John