So, diving into the rabbit hole you opened, (I searched for which frequency Marconi transmitted) I have learned that Marconi’s radio transmissions from the late 19th century, essentially a spark trying to broadcast Morse code, have travelled beyond over a hundred stars!
I also learned of the work of Reginald Fessenden whose genius is seemingly unrecognized.
https://www.ieee.ca/millennium/radio/radio_differences.html
I also learned that Smart phones have half a dozen antennas in every unit. I’ve learned a lot this morning!
https://www.bing.com/videos/search?q=radio+frequency+spectrum&&view=detail&mid=598D929FD23B73270D49598D929FD23B73270D49&rvsmid=778D87DD65095C42BD06778D87DD65095C42BD06&FORM=VDQVAP
I have that insatiable appetite for knowledge myself... about EVERYTHING. I swear it is a form of ADD. “Wait? What’s that?” Click, click, click! 12 hours later... “What time is it???” lol
But I have played with HAM radio a bit and it stands to reason about the radio waves. I think we are currently receiving waves from the the outer boundaries of the universe with radio telescopes as it is. But I think it will be thousands of years before our transmissions will reach out that far.
Always did want to set one of those up in the backyard... :)
But it goes deeper... EVERYTHING resonates at frequencies on the sub-atomic level. You, me, light, everything. Dive into that reality, it will definitely keep you busy for awhile. :)
I hope you understood I consider “mine” as ADD not yours. :)