I second what vj9999 has said on circular LNBs. Since the signal has either a RH or LH polarization.
However, when you have a multi-lnbf dish setup (i.e.
Dish 500), then you will need to setup the "Dish Skew" correctly in order for all lnbfs to receiver maximum signal. That is because the dish is receiving signal from more than one satellite on the ARC and each satellite has it's own elevation.