The series start with https://k9zw.wordpress.com/2019/09/10/im-a-ham-or-am-i/
Okay, active countermeasures are a different level of action intended to enhance your Security, Privacy, and Anonymity Exposure as an Amateur Radio Operator.
Suggestions here are mostly low-tech, as we are not going to pretend we will spoof voice-printing and transmitter-technical-identification.
What the goal is will be to provide served agency services while avoiding compromising your personal and family security, negating your privacy and completely losing your anonymity.
Reasons range from physical security to reducing your personal exposure when the legal (or political) jackals decide to see who they can take a bite out of.
The list is not comprehensive, and is intended to get your thinking down the paths that will preserve your security, privacy and anonymity best.
Your Personal Transponder:
First is almost all of you are carrying a personal transponder. Yes, your cell phone. Having an awareness that if the cell system is up, you are located and identified is important. While not commonplace, it is possible that this information drifts out to where you might not like it.
Your strategy might be to turn off and shield your phone. Or leave you phone at home and use a burner-phone while activated. Or go phoneless.
Your Transport Transponder:
If you vehicle is contemporary it will have one or more transponders active. On-Star is one. Other telemetric systems may be active or it may respond if “pinged.”
Countermeasures include removing the gear (difficult if recently built), shielding the transceiver parts, or feeding the system misinformation. Easier is to use a pre-transponder vehicle.
If conditions allow and you have the ability to work remote, your physical presence may be obscured. In warfare often the transmit antenna or antenna/transceiver for some systems is displaced from the operator for exactly this sort of reason.
Going digital comes to mind, as does using a phrase-based system to convey information. Makes more sense to transmit “Cowboy sees Mouse” – a phrase that is NOT encoded and means exactly what it says, and then have a cheat sheet where you can see that “Cowboy” means a certain operator. “sees” means is nearby or at a location, and “Mouse” means “Main House.” Sort of like when the XYL says a few words and you “know” the bigger meaning…