>> If my buddy is in my backyard blasting out Freebird 24x7 on a transmitter that can reach 201 feet instead of the unlicensed maximum of 200 feet and the FCC knocks on my door looking for him and I tell them to go fuck themselves, should I be arrested?

I don't know. Is an FCC warrant like an ICE warrant? If so, then you don't have to open the door. You can probably tell them to fuck themselves, but that's probably not a good idea.

You can't obstruct their investigation. You can't conceal what your neighbor is doing. You can't tell the FCC that your neighbor doesn't have a transmitter, or that it only reaches 200 feet when you know that that it reaches farther than that. Those are crimes, in my admittedly limited understanding of the situation.

An ICE warrant is not a search warrant. ICE did not need a search warrant in this case. They needed a warrant to arrest a named person they had probable cause to believe was in the country illegally. It appears they did in fact have that warrant. It was a real warrant. And if they facts in the ICE criminal complaint are true, this is a textbook case of someone obstructing that arrest.