FCC rules on 27.43~27.86Hz
 

The question came up to what legal users coudl be in the 27.43~27.86MHz
range.
http://www.access.gpo.gov/nara/cfr/waisidx_04/47cfr90_04.html
It lists 13 frequency allocations in tha range.

Took way too long to find this but I hope to find actual licensees
Tuesday over lunch at work.

Terry