Call it stupidity or ignorance, but I fail to see how emissions not directly aimed at something, projected to a very fine point with incredible power behind it, won’t simply fuzz out into nothingness in a short distance (relatively speaking). We communicate with our probes because the math was done on their trajectories, so we have a good idea of where they are in space. Also, since it seems the heliosphere is actually a circular, real-thing in space, how would extraneous emissions reach distant solar systems if they aren’t directed?
The extraneous emissions from a planet reach us without being directed just as light from the star reaches us without being directed. The problem is it’s an extremely weak signal by the time it gets here. Thus the need for a giant telescope.
Our Planed transmits a 24 hour cycle of 50HZ-60Hz from our power lines that is ten times brighter than the sun in that spectrum. As the planet turns from North America (60Hz) to Europe (50Hz) the tone changes.
Kinda like a low frequency European siren, BeeeeBaaaaBeeeeBaaaa.
Kinda cool. It’s like a giant “come Nuke us” signal we have been sending to the stars for years.