Thanks. Unfortunately, it doesn't do anything to isolate 1090 Mhz, which is what I had hoped. I probably have some measurement off, or something. I don't have any test equipment, so all I can do is put it on the feed line and randomly turn the screws. Things change, but no improvement around 1090. As you can see from the pictures, the filter attenuates the cell phone frequencies pretty well, but doesn't do anything to improve 1090.Nice.. Good job..
New baby sheep next door.