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CC2564MODN board dielectric spec

Other Parts Discussed in Thread: CC2564MODN

In the CC2564MODN spec SWRS160B on p. 29 the substrate dielectric of your FCC-certified reference board is shown as 4.2  What is the frequency at which this dielectric value of 4.2 was specified?  DC? 100 MHz?  1 GHz?  2 GHz?