Here is an interesting hour long movie with a realistic quote:

[Jeffersons Ghost]

4. Although this image is a poor example; what about more focused signals sent to satellites?

Last edited Thu Sep 21, 2017, 05:31 PM - Edit history (1)

Many communications satellites are in Geostationary High Earth Orbit, making them easy to find for technicians at television and radio stations. Also, certain types of military satellites orbit even higher, for various reasons. A High Earth Orbit is a geocentric orbit with an altitude entirely above a geosynchronous orbit (35,786 kilometres (22,236 mi) Signals sent to and from these satellites are more powerful and focused: However, an advanced life form on a distant planet might utilize extremely sensitive reception equipment.

Here is a beautiful image captured by a NASA radio telescope:



Not only deliberate signals are sent into deep space but also accidental signals are sent from Earth. Space creatures could possess the technology to at least detect the source of both types of signals.