Someone may be using illegal 5 GHz equipment near a Florida air base: A reader sent in a link to this Associated Press story and assumed--as one might--that the military got it wrong and was making literally a federal case out of legitimate use. But the band cited by the Eglin Air Force Base spokesperson, 5.6 to 5.8 GHz, contains part of the range opened by the military through the FCC in Nov. 2003 with some provisos. Someone might be misusing it.
Any device using the 5.250-5.350 GHz band (available for a while) or the 5.470-5.725 GHz band (new as of Nov. 2003) must avoid stepping on existing signals and back down power to only use as strong a signal as is needed at any given time.
It's possible that someone is using a 5 GHz channel that was previously assigned in the 5.725-5.825 GHz band. Since those were intended for outdoor point-to-point use and don't require the limits that are defined for two of the three lower bands, it might be legal and unintentional. Or they're using equipment not approved for use in the US or have modified US-licensed equipment. Or, even, it's very sloppy out-of-band spillover.