Because they wanted to send signals to places where wires didn't go - like to ships at sea.
Yes a telegraph can be wireless. Thomas Edison invented the first wireless telegraph
No. Broadband is just a signaling method. It has nothing to do with the security, or lack thereof, of wireless networking. Wireless has very limited security since it is open to the public.
The first wireless device invented was the wireless telegraph in 1935 by Guglielmo Marconi.
marcon
i did
No
Yes the wireless patch for audio guitars and such have been invented for over 30 years
Geoff Goodfellow
1325
Nikola Tesla
Guglielmo marconi
2003