s @geckoVN already stated it depends on your setup and your environment. An additional filter can help, but not in all circumstances.
I also have the blue dongle and additional the FA filter (dark blue) between the stick and the antenna. It “feels” that i have a marginal improvement, but so far i cannot find evidences. I am able to increase the gain, but the long term values are pretty similar to the ones without filter
There’s one thread available wit lots of information to read:
