If you'd like a good demonstration of how a jamming device could be found, simply buy a high-power 10 meter radio transciever and set it up to constantly transmit music at 28.400 MHz. You'll effectively monopolize the frequency over a large distance, and within a very short period of time the FCC will arrive to demonstrate their RF tracking techniques.
The FCC will care if you are transmitting without a license, broadcasting (rather than performing 2-way communications), and sending music--all three of these are violations of FCC regulations. Once they determine that it's an ongoing disruption, they will come out with a direction-finding rig, as they have in the past for "pirate" operators causing disruption.
And to levy a huge fine. Do not do this.