He likely has his power boosted, I don't think he should be giving you such interference problems if he is broadcasting within legal limits although it is still possible he's legal. The only time I ever saw this problem before the perp was using illegal booster equipment to jack his signal up, he would only run it for short periods because the FC was actively looking for him. The whole area was screwed up whenever he keyed his mike and he didn't give a rats ass because he thought he was cool. He finally stopped when my dad paid him a visit and told him he was going to shoot his antenna down everytime he pulled that crap during normal hours, which he did within hours. The perp called the Sheriff and ended up having his whole rig seized.