Probably. Keep in mind, this is just a somewhat educated guess, but- the power's probably in the ley line, rather than just radiating outward. At most, it might be disguised by the ley line's own power, but in this case, that would probably be like expecting a desk fan to cover up the noise of someone shouting.

So once we find the right line, we search along it for likely spots- we'll need help.

Just not Lucifer's for the Charter's sake!