Well, there is a paid version (which I didn't try), presumably without ads. As for the Lite version, I don't know exactly why, but ads in this particular app never load on my phone. I see only a black space at the bottom where they supposedly should be visible, but they never load for some reason, without any action from my side. And I think the same happened on my previous phone too, need to check later.
That might be the worst app I’ve used on my iPhone in a year. Better off vibe coding an app to give you signal strength.