absolutely. raising the noise floor would make it harder for the adversary to pick up valuable signals. but why bother with complicated jamming setups that require you to cover a very wide spectrum, at high power, while taking care of not interfering with your own equipments, and still have signals going out that with sufficient means and motivation, a sophisticated attacker may still intercept (we're pretty good at extracting valuable signals from noise) when you can just put on your RFP to stick the lot in a faraday cage, use optical connectivity inside it, forbid wireless HIDs, buy shielded monitors and shielded phones, and put a couple of scary bald men in front of the door.