Now I'm by no means new to OTA TV, but a strange thing is happening. I put up 3 high gain TV antennas last fall because I wasn't about to let cable jack up my cost anymore. One mast pipe has a stacked VHF and UHF YAGI to the east and the other a UHF YAGI pointed north. They both have preamps. They've worked extremely well all winter long. 44 channels including subs in fact. Just within the last day, they conflict with each other. I first thought one of the power injectors was at fault. Not the problem. I disconnected the U/V antennas. What I found interesting was the UHF pointing north picks up all the channels from the east and north including the VHF channel on the disconnected antenna. My guess is the disconnected VHF antenna is effecting the UHF pointing north. My assumption is signal strength is coming in stronger than it did during the winter. Now I've spent 40 years building antennas from wifi to sat dishes to ham radio. I've never in my life seen something so absurd as this issue. Digging deep to find the answer. Is it some form of short term atmospheric conditions, or do conditions in winter vary greatly from spring? It's been many years since I've played with TV antennas.