Cannot finish the screen stealing

[YY-chen555]

Hello, i watch this video https://www.youtube.com/watch?v=QjqpKtGNbQo and ready to replay this experiment.

I can here the song. I think it's mean that I get a right frequence. Like this.

But I failed to use HackRF and TeamsetSDR to steal the screen.I think i set the right parameters.(I set the correct frequency, but I forgot to take a screenshot, so there are different frequency values）

I watch this videohttps://www.youtube.com/watch?v=wWbLMDlV-9M. Now I can get new result. I can confirm that each vertical square should be my screen, as they change when I scroll up and down the screen. But this is too small to see the exact contents of the screen. Maybe I have a setting or operation error, how can I complete the screen stealing. Thanks!