Its a pretty good series of Sci-fi books.

Aliens invade during WWII. With just one problem. They didn’t know mankind had entered the industrial age and thought they would only face horse riding speermen.

Remember the sci-fi story when the title of an alien document was decoded,- “To Serve Mankind”

Worldwide relief ensues

Turns out it was a cookbook.

I fully agree with you.
Any species that has the capability of actually getting to us would have the capability of hiding from us in some way.
Why would they find it necessary to fly around in plain sight teasing us?

But also they might not have the capability to come close to the speed of light and at this moment could be building a generation ship with the sole purpose of colonizing this planet. They would not be able to see any advanced industrialization until they get far closer to us and by then they might not be able to turn around.
How would or could a colony ship of 10,000 people with a tech level only a little above our own invade us?
If their tech is too far above ours we stand no chance at all. Turning us into slaves would be our best outcome at that point.

“Whiggish – of, relating to, or characterized by a view which holds that history follows a path of inevitable progression and improvement and which judges the past in light of the present” – Merriam-Webster

We as a people can now look out and see other planets. Or at least extrapolate them very well if not actually view them yet.

Couldn’t a people a hundred years or so ahead of us tech wise not do the same thing in our direction?
And if so couldn’t they see that this planet is very populated with a very wide variety of life. Someplace quite likely to be habitable to them.

They could at least be getting ready to send a colony fleet right now. Are we going to be ready?

Let alone the local universe?

Pitiful.

Now what is my neighbor doing now ….. ??

They did not even consider anything about the omnidirectional signals these 100 years of signals had (as MadRocketSci stated). This is a real problem. How big does the antenna have to be to receive it? The size of a solar system? Plus there is noise that would baffle the observer.

Directional signals would be more likely to get there, but its hard to have a transmitter signal point long enough to be seen directly at a possible target, and have the target be able to aim a receiver at this signal long enough to hear it. Everything is rotating or revolving so unless receiver and transmitter is in space, pointing is a challenge. So, relying on spurious directional signals seem highly unlikely to be seen or repeatedly seen.

The best thing the report implies is that one might be able to detect atmospheric products indicative of life or civilization. Maybe not definitive, but pretty good.

2) ” It isn’t necessarily so that just because our radio signals have reached a given distance that they are detectable at that distance. It seems to me that practical interstellar communication is necessarily a directional affair. The Aricebo message might get somewhere, but anything omnidirectional is going to peter out fast.”

It’s called the inverse square law

That’s Uranus, not Saturn.

My repost of a post of mine on another blog: https://www.amssolarempire.com/Blog/?p=679