[gwbas1c]

Uhm, broadcast on the same frequency? It's not that hard to figure out what frequency Marconi was broadcasting on.

[IAmBroom]

Those were the early days of radio, as in "Let there be light" kind of early.

Very few people could even build a receiver, much less tune it.

[TRiG_Ireland]

Nah. He just did a broad spectrum broadcast which any receiver in the area would pick up. Today, it'd probably be illegal. Tom Scott made a video about it, and mentioned that. https://www.youtube.com/watch?v=sP2qqMegNKA