Chief is right on everything he said. Especially the part about, "Your signal, you should know how to do that..." I get this quite often.
I spent almost 3 years at Ft. Drum (my first duty station, got there as an E3). I was in a Signal Company, meaning there were more than just Uniforms there. We each had our seperate part. I, being a Uniform was assigned to the Retransmissions Section. So all I worked with was radios, we had other guys for everything else signal. So I didn't actually learn anything but radios (other than the bits of cross-training that I got from the guys in my spare time).
If you don't know already, a Retrans section basically will set up a site halfway between the HQ TOC and the Infantry guys out on the ground to help stregthen and "push" the signal of the grunts. Easy, and boring too.
Alot of the stuff in a Signal Company is very busy at first setting everything up, and then from there is fairly simple and slow (until something goes wrong).
You could also get put in a S6 shop, which then you will be working more automations(computers/networking).
Retrans and S6 are where Uniforms get put a lot of times, but there are lots of exceptions out there too.
If you want to know more, just give us a little more info once you find out what type of unit, company, section you will be in.
If I am incorrect on something I hope someone will chime in and help correct.