No, they think it’s space.

Just because you call it non-directional doesn’t mean it is. They all have gain compared to a theoretical isotropic antenna.

Show me a non-directional antenna.

It’s easy, you just need a big antenna, low noise receiver (just cool it) for low bandwidth (keeps noise power low) and no interferers in the same frequency band.

At that point in the story Dumbledore knew fuck all about Harry’s connection to Voldemort.

There’s an even larger one between the atlantic and pacific ocean, just north of the gulf of mexico.