Joseph,

You will find it difficult to get below -170 dBc/Hz. However, you can use
cross-correlation to get as low as -220 dBc/Hz.

Rubiola is a wealth of information on cross-correlation. You can download
his papers at

  http://rubiola.org/index.html
  
See "The cross-spectrum experimental method, February 2010"

See also measurements by John Ackerman:

  http://www.febo.com/pages/cross-correlation/

MRM
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