So even if you don't plug in, say you're on a train or in a park, you can't legally watch live TV without a license for your home? I remember 15 years ago peopl

So even if you don't plug in, say you're on a train or in a park, you can't legally watch live TV without a license for your home? I remember 15 years ago people (not many admittedly) having battery-powered handheld TVs - if a homeless person were to use one of those on the street would he be breaking the law?