>>9244453>>9244454>>9244452Actual size of a meaningful transmitter circuit and the necessary antenna size.
Might be possible to scale down even more today, but there is a practical limit.
Also needs power.
Thus one can build/use an EMF spectrum analyzer to detect the RF source that induces the current that drives these.
In fact for those who worry, it is possible to build a really good EMF spectrum analyzer for about 100USD.
Then you can distinguish all types of transmissions, wifi cellular, radio, frequency hopping police radio etc.
Cant listen in though.
Because of this, almost ALL bugs and covert spy gadgets are storing the information locally and have to be placed/collected manually.
