[Dkumpikolo]

Yes

But for high speed the smallest antenna is still centimeters wide.

[solardev]

Interesting. I wonder if you can space it out virtually by having several iPhone users stand near each other and form a virtual antenna?

I don't need to be able to stream 4k from the woods, but it would be nice to be able to download topo maps and such while hiking.

[Dkumpikolo]

If it's only about the antenna you should be able to connect it with a cable and put it on a backpack