LO harmonics - Expected levels


I’m wondering what is the expected level of LO harmonic in the RX PLL.

So if I tune to 400 MHz, the LO will have harmonics at 1.2GHz (3x400), 2GHz (5x400), …

What are their levels compared to the main tone ? (trying to figure out what level will be the signals leaking from 1.2GHz compared to my signal of interest at 400 MHz).