Here is a viable alternative to the RTL-SDR Blog Triple-Filtered LNB:
I grabbed one a couple years ago and had really nice results until I left it out on my test rig on a stormy night (stupid monsoon!) and water-logged it. I just grabbed another from the seller I linked which only took two weeks to get to me this time and took them apart since I’m the curious type. Luckily they forgot to shave one of the LNA chips on my old one.
From what I can eyeball, stage 1 goes through a Qorvo 3M9008 LNA, then through a Tai-Saw TA0970A Filter, rinse and repeat for the second stage. (The blue links will get you to the datasheets of each).
While the components aren’t top-dollar, they have respectable specs and the final result parallels that of the RTL-SDR triple-filtered LNA for my location.
The pitfall to this design is that it doesn’t work with a bias-tee, so you’ll need to supply ~5v (Max = 5.25v) external power. Also, since amplification comes first, it could get overloaded in a very high noise environment, but I’m in the middle of a large city (5M people or so?) and haven’t seen any issues, actually less than with the ProStick Plus.
It comes as pictured in the linked ad and will need to be taken apart and waterproofed if it’s going to live outdoors since the case leaks like crazy as-is.
I have zero affiliation with this device or any of it’s supply chain, I’m just an average dude that likes to test and am sharing what I ̶f̶o̶u̶n̶d̶ purchased with my hard-earned money.