> there are theoretical limits for each medium. I would rather say that there will always be limits of our understanding and building equipment for usage in va

> there are theoretical limits for each medium. I would rather say that there will always be limits of our understanding and building equipment for usage in various mediums, even in a vacuum, we're still only probing our theoretical knowledge of null boundary interactions between photons[0]. > For example, a standard cellphone can fit an array of 72 antennas operating on the 39 GHz mmWave band. A similar 72 antenna array in the 700 MHz low-band frequency would be larger than a typical home door. And what would it cost? In an environment where cellphone sales have been declining for at least 5 years now at least on the high end (all the games Apple has been playing with sales reporting…), which end users will be willing to bear the cost of the device now? [0] https://www.youtube.com/watch?v=bH7OGkEZX7I https://www.youtube.com/watch?v=bH7OGkEZX7I