You would need to put your keys in a faraday cage.

Distance doesn’t matter, as they can just use a bigger antenna or better amplifier. You find footage of people using large loops of wire to capture the signal from the keys

Cheap items/electronics can be more expensive on Amazon than direct, though.

Amazon:

Direct:

I only use wired headphones. I don’t like earbuds, and Bluetooth headphones are too bulky and need charging.