I'd recommend using stranded center conductor coax cable, not solid core center conductor coax cable which is more typical. The stranded core is more flexible and should withstand the type of multiple cable flexing we see in the field better than solid core cable.
Something like the Canare LV-61S, L-3C2VS, or L-1.5C2VS. I've used the latter two ones for a number of digi cables. You should be able to pick them up from markertek.com.