What is the unit you have? How will I ensure I won't overload WKBW, WIVB, and WNYO? These are the 3 channels I'm concerned might overload if I install a strong preamp, they're sitting at about 80-85%.

I don't think I need insane gain values. I just need to prop up WGRZ, CITY, and WUTV (all three hover between 28-35%) during the winter (summer and tropo days like today it's as rock solid as other stations), and bring CIII and CKXT (25% each), which are almost recievable (need 33%) as I get blips of PSIP data on occasion.