The cable is just as important as the aerial (and any amp or splitter, if fitted) in providing a decent signal on your set. The cable should be changed as a matter of course if any work is undertaken on the aerial, unless you are sure it is sound and of good quality.
NOTE the WF100 we sell is not the same specification as CT100.
WF100 is pure copper throughout but the braid and foil of CT100 are copper clad aluminium. Only the centre conductor of CT100 is pure copper. And I only found that out in Dec 2023 !
A typical cable run (from the roof) is about 15m. Bear in mind that it is preferable to order a bit too much, than a piece that’s a bit too short….. Any extra cable can be made into fly leads, which, I guarantee, will be better quality than those you already have.
For (up to) 30m of this cable the P&P is cheaper for this item if you phone the order through !