Does anyone know what kind of Antenna the writer of this article (excerpt below) is referring to? One that you can turn on or off, specifically. I've looked online but it's all confusing to me. I know nothing about antennas.

Thanks in Advance.

"High-frequency Antenna

Another way to deal with loud music is to use a high-frequency antenna.
How does it work? When you turn the antenna on, it makes the neighbors’ speakers emit a buzzing sound that’s very annoying.
Remember the buzzing sound of cell phones near speakers? Well, this is pretty much the same.
As a result, your neighbors have to turn down the volume."