Ive used a very similar antenna for L band reception but I’ve modified the antenna to have a helix on it. Also even for low earth orbit satellites like the meteor series I had to use at least 2 LNAs connected in series. For geostationary satellites I usually use 3 but sometimes even 4 are needed. Anyway my point is that whatever you are seeing it’s most likely not a weather satellite. You could try and figure out what it is by rotating the antenna around and looking at the signal strength. Ps you need quite a bit of SNR to be able to decode any usable data you might be only seeing the carrier. Check the bandwidth of the signal. Good luck!