Quoted from http://www.lwca.org/sitepage/part15/index.htm
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Yet another allows operation in a 14kHz-wide band centered at 13.56MHz,
with a maximum field strength limit that works out to about 1.8mW into a
quarter-wave vertical over a groundplane.

an old friend wrote:

Is that legal??

at some power level it is legal exactly what that evel is ans wether he
meeting is not known to me