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At the end of July, the FCC's engineering office published two sets of results from a four month trial of agile radio equipment submitted by the "White Space Coalition", which includes Microsoft, Google, Intel, Dell, and HP.
"Depending on the effectiveness of shielding of a TV receiver's tuner, emissions within a broadcast white space (i.e., within an unused broadcast channel) could potentially cause co-channel interference to a TV receiver tuned to a digital cable channel that overlaps the spectrum of the white-space device emission," the FCC noted.
The lab found that the spectrum sensing of the equipment it tested couldn't detect the white space with sufficient accuracy.
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