Well in a nutshell, communication equipment is supposed to transmit electromagnetic waves to communicate with other equipment. What would “shielding” it mean? Its whole purpose is to send and receive. Preventing electromagnetic waves from getting to it would defeat the whole purpose of a communication device. If you only block most frequencies and leave some frequency open to communicate on, then the drones can use that frequency too. If you flood all frequencies with junk, than there’s no way any communication equipment could work because the signal will be overwhelmed by noise.
Anyone who knows more feel free to correct me if I’m wrong, but I think that’s the basic issue. Either everyone is blind or no one is.
The electronic warfare being used are basically all types of jamming, flooding frequencies with random noise, not really electromagnetic pulses in the sense of using electric waves to induce charges in an object to disable it. Something like that would take an immense amount of power.