I have a Channel Master Stealthtenna 50 in my attic connected to a Dish 612. I am receiving all channels with signal strength in the 70s, but on occasion one channel will pixelate and break up. I also lose signal during inclement weather. I was thinking of adding a preamp - something like the Titan CM-7778. Think this will give me the little boost I need? Are there any other good preamps out there?