There are no license free bands or frequencies in the 700~800 spectra.
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At the moment, December 9, 2024, the FCC has allocated 902-928MHz for license free part 15 operations.
There are many restrictions that might be both difficult to understand and comply with. However an industry group wants to steal some of the 900MHz part 15 frequencies.
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The FCC allows 2W operation on some FRS channels as part of the FRS license free system.
This would probably be more practical.
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Gooey