Does anyone have a C-Band Channel Master Feedhorn? If So How Does It Work For You ? let me know guys is it hard to tune?
You could try making sure that your feed horn is centered on the dish, that the focal length is set correctly, that the dish is round and flat across the face. All of these things will affect performance. If you find that the feed horn is off center and correct it, you will probably need to tweak the dish aiming a bit. Or, it could be your lnb is weak. I guess it could be a lot of things.
Which channels come in sparkly? They might just be weak in your area also.