They could stop HAM communications if they put every electronic warfare plane we own in the air 24/7. It would also have a hugh and series impact on the cell phone network. Probably not something they would do. HAM communications can be burst transmitted - very hard to track and trap. I am in Reno listening to a $30 HAM handheld radio. There is two conversations going on on frequencies I monitor. One is between Australia and a guy two miles from me. The other is two guys with hand held radios talking between Reno and Salt Lake City using the repeater network and a mobile spot parked along I-80. The Mobile will be moving on shortly to his next scheduled stop. A few hundred of those and the feds have no chance of shutting it down.
Bfl