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Antenna size is directly correlated to wavelength. Minimum antenna size for 5G signal is ~3mm. AFAIK there are some tricks to reduce that slightly, perhaps to 2mm. That's still 4-5 orders of magnitude beyond what is considered nanotechnology. Not gonna fit through the needle either.
How many nano particles do you need to align to reach 2mm? ...
They guy is a dope. He thinks that nobody can figure out that a variety of antenna designs work well even being less than a wavelength in size. Else an AM radio would have to be 300 meters long.