What would Earth have to do to "go dark"?

The US Government, and eventually the UN and all nation-states around the world, have realized they are broadcasting their existence to potential enemy civilizations in the nearby galaxy (at least to those that happened to be paying attention to the electromagnetic spectrum, particularly radio waves).

(Most of) The nations of the world want to bring this reckless behavior to a stop. At the very least the US, China, the EU and Russia have all been convinced of the importance of this. They've set a timeline of ten years to bring it about.

What steps would be necessary to stop this constant production of signals? What types of changes would the people on the ground notice? I imagine that radio frequencies would become a lot more regulated and cable and "tight beam" type communications would be explored. Are there frequencies that don't propogate that would still be legal?

Edit: To clarify, I mean any potential civilizations in nearby interstellar space. Not neighboring galaxies.

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What would Earth have to do to "go dark"?

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