I think I'll stick with the bullet antenna. It's the right shape and has been fine for the Thunderbolt to use. My TB is used for my NTP server and for 10 MHz reference and I check it regularly with several tools. I think it's somewhat of an apples to oranges comparison when considering patch antennas in a window sill. The latter work great with the equipment they are meant to, but the results definitely vary. As I said in my original post, the Adafruit active antenna works exceptionally well compared to any others I have tried before, so I'll probably just design an active splitter/board (for fun) to get what I need - vs buying another patch antenna from Adafruit. Russ K0WFS