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Note on #35:

The diagram shows "white blobs" in the illustration..
This is atmospheric interference or blocking of the frequency in that range..
Those frequencies in the microwave and infrared range are filtered by the atmosphere, as are the UV, X-Rays, Gamma rays..

I'm guessing that works both ways.. (obvious) and that such outgoing frequencies being transmitted are filtered as well..
This would tend to kill the "brightest radio source in the galaxy" theory..

Remember that most of the AM radio spectrum doesn't even get out of the atmosphere, it actually "bounces" off the stratosphere, and is reflected back to earth..
CB radio operators refer to this as "working skip", and use it to communicate over very long distances, far beyond the capabilities of their 5 watt transmitters..