13.56 MHz ISM band is close and the next two harmonics are also ISM. But
transmitting power at that frequency might keep my RFID access card from
working :(

Cheerful regards,

Bob


On Tue, Feb 7, 2012, at 05:27 AM, John Gardner wrote:
> At 10 MHz 97% efficiency may not be enough to wave off  FCC
> black helicopters...

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