Do I Need A Filter?

Hi, sharing my scan, first time looking at a signal, not a lot of planes today due to covid restrictions. What do you think? I’m using a Nooelec 820T NESDR Mini with factory antenna.


And can you explain please the sort of “complementary” colors between 870-880 and 880-890?
I was sure that the GSM band was 850-900, not seeing anything there, but some in the middle.
Will love to know too what is “pulsating” at 939mhz.

This is what I found in Amazon that delivers here, both cost more than my entire setup xD

https://www.amazon.com/dp/B07QGMDFXQ/ref=cm_sw_r_cp_apa_i_l2IIFbFMJV5T8

https://www.amazon.com/dp/B07QCL1HXD/ref=cm_sw_r_cp_apa_i_33IIFbXW2J3Y0

Thanks!!!