I wrapped the orange FA ProStick with aluminum foil (about 6 layers on each side) made sure the foil was grounded to the 50 Ω terminator. And then placed it all in a heavy metal box (this box was not fully closed due to a 3 foot USB extension.)
Here is the result but with the gain set to 20. So I’m guessing the 960 MHz signal is more related to the orange FA ProStick then an outside signal.
rtl_power -d 00000978 -f 800M:1200M:100k -i 30 -c 50% -e 30m -g 20 -F 9 > scan.csv