That which is communicated is non-physical- a concept- and the means of communicating it are physical.

But, all of our concepts are mental images formed from our experience with sensible realities.

The underlying question should be:

Do ideas and concepts exist apart from the sensible images of which they are composed?

I would say yes, because one idea can exist under various images and examples.

Is THAT concept, stripped from images, when communicated via a sensible medium- sensible or insensible?

"Belief, by definition and research, is such that generally permits ignorance of evidence.
Something that generally permits ignorance of evidence, contrasts science.
So, whether or not I exist, belief remains a concept today, that generally permits ignorance of evidence!"

But-
1. All men are ignorant of something even in their fields of expertise.
2. There is no science that has exhausted knowledge of its subject.
3. Therefore there is no science that can be more than belief. It is simply a matter of degree. Firm belief vs. weak belief.