Many native English speakers call a group of things that work together to do something a "rig" (a stereo is a group of things that work together to reproduce sound [voice and/or music] {like speakers, an amp, a turntable, a DAC, an AM/FM receiver: would be an example of a group of things that work together to make stereo music}.
If you have more than "rig" one, you might want to switch between it's different parts or different "rigs" (in this case stereo systems).
An example of another different type of "rig" would be:
a device or piece of equipment designed for a particular purpose
Example: a lighting rig
So that would be a "rig".
If you have AM or FM radio (or stereo) or use Blue Tooth (a radio, like a walkie-talkie) for pieces of the stereo or computer to communicate with each other, there needs to be antenna's to transmit and/or receive the radio waves.
In
radio engineering, an
antenna (
American English) or
aerial (
British English) is an electronic device that converts an
alternating electric current into
radio waves (transmitting), or radio waves into an electric current (receiving).

An automobile's
whip antenna, a common example of an omnidirectional antenna
View attachment 439225
Bluetooth antenna
I hope that this helps.