It was requested by tarbat and me, that ANRB V6.XX.XXX should be useable with dump1090.exe to be able to do all the altering stated here. But currently V6.00.000 does not use dump1090, but direct hardware access. Therefore no gain altering or oszilallator offset compensation is possible with V6.
Using a narrowband filters to block out all unwanted frequencies is almost always a good idea.
About integrated AMPs: For non mobile installations, like mine, they are useless. Generally I would say: be careful with amps, in many cases they do more damage than giving you benefit.
Ingo