If you're generating RF with homebrew stuff, get a spectrum analyzer.[1] They're much cheaper than they used to be. Then you can find out if you're blithering all over the RF spectrum, and how badly. It's better to find it out yourself before someone from a cell phone company shows up, spectrum analyzer in hand. Cellular providers call this "spectrum clearing". There are now automated systems to help with this.[2]

[1] https://www.digikey.com/en/products/detail/seeed-technology-...

[2] https://www.viavisolutions.com/en-us/products/interferencead...