I am having a heck of a time obtaining peak signal strengths. My set up is a HR20-700 and HR22-100, with a chimney mounted WNC Model BAU slimline dish. I had originally installed the slimline dish in 2008. My signal strengths on 110 and 119 are in the mid nineties, and also have have applicable spot beam transducers readings on 99 and 101 in the mid to high nineties. However, my conus beam readings for 101 are only in the mid eighties and, and for 99 and 103, in the high seventies to mid eighties. I thought these lower strengths were typical for this area of the country (south of Minneapolis, MN in Zip Code 55378), but I was recently at a friend's house and his new Directv installation is showing everything in the mid to high nineties. Using an Acutrac 22 Pro, I have attempted to improve my signal strength, using the dithering process, without success. I have also done the following without achieving increases in signal strength. * Replaced all coax line between the receiver and disk (RG6 rated up to 3 Ghz) * Replaced and used DirecTV approved F connectors. * Replaced the LNB (now a 5 LNB SWM) * Bypassed the sat line surge protector (and there is only 1 four way splitter between the dish and receivers). * Re-plumbed the EZAlign mast (dead center in the built in bullseye level and level placed on mast) * Although there are taller trees 100 or so feet from the dish, I have confirmed that they are not in the line of sight, both via compass/inclinometer and the Dishpointer AR app on my iPhone. The dithering process isn't really that hard, so I am not sure why I can't peak my 99, 101 and 103 signals (conus) into the 90s? 1) Although I am not seeing any visible damage to my dish, could it be defective [I did notice that when placed a level on either the top or the bottom of the base of the back assembly, it was not showing level (even thought the EZALign mast was spot on level)]? 2) How far below the line of sight elevation of the dish can trees have an impact on signal strength? Help ! ! ! Any tips or suggestions would be appreciated.