Ranking & How To Get It Better?

[GreekSpy2001]

You really want the green AirNav stick, it has a builtin amplifier and filter.

Tips on how to modify the small indoor whip antennas has probably already been posted.

Or if you want to go for something more elaborate, you can use an external LNA: https://github.com/wiedehopf/adsb-wiki/wiki/Useful-items-for-purchase#highly-recommended-combination-of-lna--dongle

An external LNA even allows installing the LNA close to the antenna and then running coax to the receiver.
That arrangement allows using cheaper coax for most of the cable run.

I can concur using the green radarbox stick increased the sensitivity and range of my setup by probably 30% This was seen by the number of aircraft I am recording at any one time.

Graham