The fusion reaction is obviously is less powerful to our receivers than 5G, otherwise we'd not have 5G. UV is obviously more powerful to our DNA than telcom, otherwise we'd all have noticed an increase in melanoma on our thighs and ears.
Antenna size and shape is important relative to signal , as is total energy, impedence, etc.
The sun does emit ionizing radiation, and that will hurt you with long-term, unprotected exposure, but worrying about non-ionizing radiation at very low-powers doesn't make sense when ionizing radiation from air-travel and radioactivity from concrete provide orders of magnitude more mutagenic micromorts than mobile signals ever will.