It's used a lot in ham radio for grounding and such, but it's also great for making an impromptu Faraday cage around an antenna. For example: https://www.amazon.com/Bertech-Copper-Conductive-Yards-Thick...

Note: that's expensive AF. I probably wouldn't literally use it to block the signal when a thin steel piece would probably work just as well. But it's an example of something you absolutely could do: find out where the antenna is, then severely interrupt its signal.