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longer wavelength also means longer antenna, which doesn't fit most use case for inside usage.



Have you seen modern cell and wifi antennas? The wavelength of wifi is 11cm so you make a quarter wave antenna and print it right on to the board [1].

1. https://www.antenna-theory.com/antennas/patches/pifa.php


"below 300MHz" means a wavelength of at least a meter.




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