As long as both cables are 75 Ohm you will have a good match, but you also have to use correct connectors, usually F series for RG-59 coax or RG-6 (low loss, a little bigger coax). RG-6 IIRC take a little different connector to match the larger wire diameter, but has the same F-series end.
Coax impedance is determined by relationship of size of the center wire in comparison to the ground shield surrounding it. As long as the size ratio stays the same, you can have a smaller or larger coax that is still 75 Ohm. That’s why you need the proper connectors to keep that relationship at the junction so there is no change in impedance at the junction.
Hmmm, then the problem would be finding the F-connector that fits this .11” dia. 75 ohm (supposedly) cable that connects the antenna to the amp.
I actually have some RG-11, but it’s too unwieldy for this usage...