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A comment on Serial Port SDR. Parent comment

Re:Serial Port SDR by tjohns on Thursday December 06, 2018 @11:35AM (#18619491)
Wires connected to a closed circuit will radiate too, if you drive them at high frequency. Maybe not efficiently, but it'll still radiate. There's nothing special about an open circuit that makes an antenna work.

Shielding (e.g. coax, or a properly grounded enclosure) is what prevents ordinary wires from becoming antennas.

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Re:Serial Port SDR by StillBored on Thursday December 06, 2018 @01:53PM (#18620907)
Normal rs232 is run through shielded cables as well. It was standard practice to wire the d-sub connectors to the cable shields. The wires themselves may not have been shielded, but the cable was shielded against being an antenna.
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Re:Serial Port SDR by tyingq on Thursday December 06, 2018 @07:57PM (#18624161)
Sometimes. Plastic DB9 to unshielded RJ12 is pretty common.
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