@lacuda @amarand
I suggest you download WeBoost or OpenSignal 4G/5G app to analyze your signal inside your home and on your roof to test for your cell signal. If its -60 dBm or a higher number, an individual (personal) antena on the roof may not be the best solution.
The residents in my building chipped in & leased a commercial Antenna to serve everyone in the bldg. I also opted to have cable wifi. Despite that I still needed an indoor signal booster because my apt is 12 stories from roof.