A word to describe local versus global radiation

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.

Solution 1:

How about scope?

the extent of the area or subject matter that something deals with or to which it is relevant

Solution 2:

Diffused vs focused would be good enough to distinguish between the two.

Solution 3:

Well, if you're writing a formal scientific paper, it would probably be best to ask a scientist in your field what the right term is.

As a layman, though, I suggest dispersion, which is defined by oxforddictionaries.com as "the state of being dispersed over a wide area". So one might say that one test is characterized by low dispersion, while the other is characterized by high dispersion.