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Yes

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

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.

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