I stated in another thread that I believe I got better reception when replacing the power supply plug for my preamp (because the previous one was damaged). But not too long ago, I had an LTE filter hooked up to my preamp on the roof in case any cell phone towers show up close. But now I think the channel 24-1 thru 24-4 (KYIN PBS Mason City, Iowa stations and I live in Rochester, Minnesota) are weaker again, and I'm not sure I'm imagining things or did I really notice it was better after the preamp power supply being replaced, but yet prior to the LTE filter being hooked up? Or am I imagining things? The RF signal for KYIN PBS is 18 if that helps, and yes it is the weakest station in my direct market. Like I stated, I had the LTE filter hooked up in case it ever needed to be there, but should I have it taken out and not hook it up until any cell towers actually get close? Sorry about the bad grammar BTW, I'm in a hurry.