I'm an RLC Comms Spec (although I keep grandfather right to be called a 'Rad Op', and as such am still eligible on 2 promotion boards a year).
We can, technically be deployed with ANY unit who uses Clansmen/now Bowman equipment. I have been on detachment with a company from 2 Para as their signallers were loaded onto a unit rapidly deployed to Macedonia.
I have also been attached with AAC and during the invasion of Iraq, was called forward to relay the grids on behalf of an Artillery regt because there signallers were used as drop shots, due to lack of man power.
Usually, you'll see Rad Ops/Comm Specs in the 9x9/box body, but we are versatile. Alot of Rad Ops work in REME lad's which are part of Infantry units. Also, those rad Ops who get the App Spec qual can work in ANY unit that has Bowman.
And yes, Electronic Warfare (ECM, etc), antenna theory, installation, maintenance, cryptographic material, laying line, BATCO, VP etc are all parts of the job
Thats why we're higher pay band.