What is radio communication? What is it based on? What device should be connected to the transmitting antenna circuit

What is radio communication? What is it based on? What device should be connected to the transmitting antenna circuit in order to transmit information using Morse code?

Radio communication – transmission and reception of information using electromagnetic waves. Electromagnetic waves from the antenna create a current with frequency in the receiving antenna at the same frequency. For Morse code, switch the key.

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