Most of the antennas in the car are for reception and do not generate radiation. I've made an extensive list of antennas and locations here:
Antenna Expose – TeslaTap (for the 2022 models)
For the current Model S, there are about 46 antennas.
I suppose you can go through and disconnect the antennas if this is a concern to you, although some features and operations will no longer be available.