There is an RC vendor I frequent who has helped test such systems. They would move around, fire up different protocols, frequencies, etc. The system could pick out with great accuracy location, RC protocol etc.... This was before RID was even a twinkle in some people's checkbooks....It is wild how easily and immediately the Government picks up our radio signatures. Central US has all of the silos and such and each coast has naval and combat aviation assets. All of which is monitored by the fine folks in Air Defense(cant say enough great things). Just like our side income we think they don’t know about, they know, they know…. most of us just aren’t those types of folks so generally speaking, we don’t have to worry about a ceiling fan of freedom (R9X) coming through our front window. Speaking of which, has anyone ever actually been harassed flying out in the boonies?