I am reliably advised 150kt is not a problem for a model plane.
It was the carriage of a Mode S TXP on a model plane which this was about. ATC is not monitoring ADS-B so you could not get somebody into trouble with spoofing that (in Europe) 
Peter wrote:
It was the carriage of a Mode S TXP on a model plane which this was about.
It has to be a big thing to show on primary radars? some will say that anything with less that 10lbs/ft2 wing load does not generate enough electrics to power a ModeS but you only need one 30 seconds blip for CAIT to generate a report
“It has to be a big thing to show on primary radars?”
Use military technology to detect primary radar pulse and send spoof echo?
And that spoof echo can spoof its distance farther away from actual position, and changing.
