Firstly you need a target to send it to. Secondly you need to handle the rotation of the Earth so that you remain on target. Thirdly, you need to send a powerful enough signal that it can be detected above the background noise at that target.
The idea that aliens can pickup a radio station or TV station doesn’t seem likely to me. The rotation of the Earth would sweep that signal across them.
They might be able to detect “noise” at unusual frequencies but it wouldn’t appear coherent.
The Voyager probes transmit with a signal of about 23 watts, and are detectable (against a near-silent background) at a distance of about 0.002 light years (20 billion km):
Signal attentuation follows the inverse-square law. A 1 kW signal is 43 times stronger than the Voyager's transmitter. It should reach about 6.6 times further.
So your 1 kW transmitter, if coming from a quiet noise floor (which the terrestrial environment is not) could reach at least 0.01 light years. Possibly further.
Rational or not, that gives me the heebie-jeebies. Random people working to attract the attention of aliens, when we know nothing of what the aliens' intentions might be, seems like such a bad idea.
You know that there are people who would eagerly sell us out to potentially hostile aliens, even if only to spite some imagined opposing political or cultural group.
The idea that aliens can pickup a radio station or TV station doesn’t seem likely to me. The rotation of the Earth would sweep that signal across them.
They might be able to detect “noise” at unusual frequencies but it wouldn’t appear coherent.