I've carried full on mobile radios w/ coiled wire and mics in carry-on, when one-waying it to transport a vehicle on multiple domestic flights and no one said boo about it. Only had the bag opened at bag check once, and some of these were only a couple of years after 9/11.
If you check it , and don't make a fuss about it...probably no one will care. If you carry it on, and don't make a fuss about it...probably no one will care. If you turn it on, YMMV.