The Left and Right of Arc for Signals Officers is pretty much 180°.
That expression means you can be doing everything from IT Support, Cyber Operations, EW, Field Communications supporting Command and Control systems, Satellite Operations coordination, Joint/Strategic interoperability, Project Management, Capability Development, and various other things that enable our forces to communicate securely; while denying that to our adversaries. It's several "officer trades" wrapped into one.
That said, first and foremost you're 70 percent Army Officer 30 percent Technical officer. Very little of your day to day is getting into the nuts and bolts of communications issues, but managing a team of experts, providing direction and guidance, setting them up for success, and being accountable for the failures.
It's a often times a thankless job, but it's an essential one. It also allows you to develop experience and skills that are both lucrative and sought after when you hand your uniform into Clothing Stores.
Cyber Operators, from my limited exposure, are starting to carve their place out in the Signals world. The trade is still young (5 years) and there is still a lot of work to be done establishing their roles on the Strategic level. As for life outside the military, it's pretty much the same with most trades: "yes the Army trained you, but where are your certs?" If you have the aptitude, you can get those certifications; but on your own time and own dime.
Hope that helps!