DPA mapped to spectral analysis

[Marcus Leech]

Has anyone considered experimenting with DPA (Differential Power
Analysis), but
  using spectral data, instead of power consumption?

Different operations will produce different EM spectra, and so the
attack
  should work, given suitable selection of frequency range.  This could
  potentially allow the bad guy to attack a card without having access
to
  the card, using a suitably directional antenna, etc.

Does anyone have an all-software simulator for Kochers DPA attack?