kindly remember that above ~6ghz the lna becomes essentially an attenuator. It is better to have it off. Most motion detectors I have dealt with have a steady output signal between 0 and 15 dbm. Given that it is plastered over I don't think the resulting signal will be very strong. Add to that the vastly reduced sensitivity of the TinySA ultra in the 10Ghz and above region you would have to be very close to the actual unit to detect anything unless you use an antenna with some gain and / or a preamp for those frequencies.