I was going to reply that it might be difficult to match the power of something like Jupiter's radio signals. However, it turns out that Jupiter's decametric radio emissions are only about the equivalent of a megawatt antenna[1]. The US air force already has a radar with a peak power of 32 megawatts[2]. So with sufficient motivation, in principle we or an alien civilization could certainly send regular signals like that.

[1] https://www.space.com/26419-jupiter-radio-waves-alien-life.h...

[2] https://en.wikipedia.org/wiki/Eglin_AFB_Site_C-6