Do the spurs increase in level when you attach the telescopic antenna?
No, it remains the same. And it is present even when the RF input is short-circuited with the VNA calibration "S" cap.
?
Can you check if you see similar spurs at 1069 MHz, 2138 MHz and 4276 MHz?
Not exactly at those frequencies (or that is just a measurement error), but some of them are there with Spur Removal turned off. When I set it to On or Auto, they are gone, except for the one at 4.276 GHz.?
