A 100' foot analog video cable is not going to give the same picture as a 6' cable.
Best bet is a good coax cable designed for video. That means solid copper center conductor, 95% copper wire braid plus foil shield, like Belden 1694A. Manufacturers can control the geometry, and thus the impedance of coax better than twisted pair. The tighter the control of the impedance, the fewer reflections that will affect the picture (ghosts). And Belden has a better record of controlling impedance than most manufacturers.
If tilt is a problem, there are tilt compensators.
If hum bars are a problem, there are ground breakers.