No idea.
OTOH, the (installed in the early 1990's) "non-yagi" design multi-element linear "X" style aerial in the attic is still working pretty well.
IIRC, having determined the correct compass alignment - and having marked the "aiming point" on the adjacent dividing wall to the house next door with a large black "X"! - I've never had any real signal strength issues. That remained true even after my party-wall neighbour lined his attic rafters with aluminium-faced thermal insulation slabs (he had followed my own advice on that as I had done the same several years previously to improve - and it did - the thermal insulation in our property) .
Thus, might I suggest that the alignment of the previous aerial was not "optimum"?