misleading title! 6

This is indeed a notch filter (it's on the label!): It attenuates 40 dB at frequencies above 1 050 MHz to promote 47-1000 MHz frequency band (which is supposed be the majority of issuers receivable) at the cost of an insertion loss of 3dB ...
In short, a filter "cleaner" to eliminate certain unwanted signals (microwaves, cell phones, etc.).
Anyway, there is no miracle: if we want to amplify a signal, whatever it is, you have a supply of energy and thus a power supply!