The very interesting tidbit here is that communication ranges work BOTH WAYS. So if your comm radius is higher, not only do you communicate the location of enemies your sensors see, but you also RECEIVE communications from further away.
This makes communications about twice as useful as I thought they were. Very nice.
Indeed, if your comm range and the comm range of your ally overlap, you can see enemies as far your ally can see. That's neat! A well-placed starfighter with full comm sensors at mid could be quite and asset for enemy spotting for the whole team.