Hi there! I'm glad you're interested in the history of communication technology. The concept of transmitting messages using radio waves was not conceivable in the 18th century. At that time, communication was mainly through letters, messenger pigeons, and face-to-face conversations. It wasn't until the late 19th and early 20th centuries that scientists began to experiment with and understand the properties of radio waves, leading to the development of radio communication. So while the idea of transmitting messages via radio waves was beyond the imagination of people in the 18th century, the rapid pace of technological advancement in the centuries that followed made it a reality.
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