I'd like to replace my WSI NS741 LBNF with something else. I'm looking at the Chaparral Polorotor Feedhorn (c-band only). I already have a California Microwave LNB that I could use with it. My question is, is the skew control automatic, or do I have to have a polarity control for it. I'm having some unexplained interference problems (image freezes, signal drop outs). What would the benefits of using an Orthomode Feed be? Thank you in advance for your guidance .