DerbyBorn wrote:
Loft would be worse as it would then be faced with the signal being
degraded through the roofing materials.

That seems to me a little too firm given the OP said the aerial is wall
mounted. The loft might then put it higher where the loss from roofing
materials is less than the loss from the leaves etc. Or it may allow a
position to one side of the tree. And it may also be easier (and more
acceptable to anyone with an aesthetic veto) to fit in the loft an
aerial with higher gain.
--
Robin
reply to address is (meant to be) valid