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It's about time to wrap this thread up, 10 years on and miles in the rear view.
Several RAO´s (Radio Observatories) like Aricebo and others now in the US have gone online...
Another slight (but not insurmountable) problem I have is in the stars mentioned.
Aldebaran is 65 light years away, and an orange giant star (K5III). That doesn't bode well as an origin point of life, but a colonial type setup couldn't be ruled out. If it were a colony, then one would expect there to be stars relatively closer to it sending the same sort of communication signal.
Izar is Epsilon Bootis, a double star consisting of an orange giant and an A2V star, similar to Sirius. it's about 300 light years away. Because of the distances involved, one would expect similar signals closer to it, too.
Epsilon Eridani is a K2V star (somewhat weaker than the sun) about 10.5 light years away. That's more like what we would expect. The problem is that it's only about 1 billion years old. Taking earth as an example, at 1 billion years we had microbes, and not much else. Stromatolites, even, were still 600,000 years away. On the positive side, epsilon eridani is thought to have two debris belts (probably asteroids) and at least one gas giant planet in an orbit 3.4 times the distance of earth from the sun (too far for life as we know it). That, however, is still under dispute.
Thuban is a binary star, with a primary star of A0III (white giant) 250 times more energetic than our sun, and has a companion star (proobably a red dwarf) in a 51 day orbit. These conditions don't bode well for the formation of planets around this system at all. Thuban is about 310 light years from us.
Proxima Centauri is the closest star currently to the sun, at about 4.25 light years. It's the third star in the trinary Alpha Centauri system, but is far enough from the first two to allow planet formation. No planets have yet been detected there. Proxima's spectral type is M5.5e, a red dwarf. The 'e' means 'emissive', a star subject to violent flares. Because it's a flare star, and a red dwarf to boot, it's not a likely candidate for life as we know it, even if it has planets.
Keep in mind that the distances listed are distances from Earth, not straight-line distances between these stars, which are spread all over the field. Because of the range of stellar types, everything from red dwarves to white giants, they aren't likely to harbor the same sort of life as each other, or us, if they harbor life at all. Also, electromagnetic radiation being limited to the speed of light, and UV being a wavelength of the E-M spectrum, UV communications between these stars and earth would take the amount of time listed as 'distance' in light years to travel. Generally, they shouldn't expect any return messages in a human lifetime (except Proxima and Epsilon Eridani). I've not done the math to find out how far they are from one another.