I am writing a paper, in which I perform experiments with electromagnetic radiation. In some tests, I radiate interference all over the target, while in others I use a very directed antenna to radiate on a precise location of the target. I am looking for noun that could describe this differentiation (local radiation versus global radiation). I thought of "extensiveness" but it sounds too philosophical for me, is there a more fitting term?
I can't provide an example sentence since it would be used as a column header in a table.