hi do Antenne....!
raflegi mirare her.
LOL @FET
The audio cable is used as antenna, the HF signal is separated from the audio with a small capacitor.
http://www.circuitsonline.net/forum/search?query=dnt&mode=and&…
If you want to increase the signal strength, make sure the audio cable is 75cm long. Connect another 75cm wire to the ground of the transmitter, and use these wires as a dipole antenna.