https://www.iridium.com/wp-content/uploads/2021/07/mini3.jpg
Here it is with the case removed so you can see how big the helical antenna is.
https://fccid.io/img.php?id=1547768&img=bg1.png
Apple dumped a bunch of R&D money on a group of antenna experts years ago, so we'll see if they came up with a flat alternative to a helical antenna for satellite communications in the same way that the terrestrial cell phone networks did.
